what logistic issues related to medical supplies should hillside consider?

J Healthc Eng. 2019; 2019: 9691568.

Six Sigma Awarding in Healthcare Logistics: A Framework and A Case Study

Lina Al-Qatawneh

¹Department of Industrial Engineering, The University of Jordan, Amman, Jordan

Abdallah A. A. Abdallah

^twoGraduate Schoolhouse of Business Assistants, The German language Jordanian University, Amman, Jordan

Salam Due south. Z. Zalloum

³Department of Project Management, Incube Mobility Solutions, Amman, Jordan

Received 2018 Aug 16; Accepted 2019 Jan xxx.

Data Availability Statement: The data used to support the findings of this report take not been made available because they are confidential to the example report hospital.

Abstract

Half dozen Sigma is used heavily in diverse industrial sectors, yet no noticeable applications are seen in healthcare logistics. This newspaper reveals the special case of healthcare logistics where price reduction is not the merely gene considered in project selection; performance and criticality of each item in the logistics system are of high importance likewise. This newspaper provides a proposed framework to apply 6 Sigma in the expanse of healthcare logistics. Information technology also presents a instance study implementing the proposed framework at a Jordanian hospital. In the case study, the paper reveals how the modifications of the define stage to have into consideration the criticality, toll, and performance of items make typical Half-dozen Sigma methodology very beneficial for healthcare logistics. In addition, it shows how the Six Sigma project selection tin can exist done to deal effectively with healthcare logistics bug. This paper paves the road for research to elaborate on ways to utilize Six Sigma in the area of improving healthcare logistics.

i. Introduction

Hospitals generally think of their offerings as services rather than products. The cadre service is patient care. Still, the provision of medical treatment and patient intendance creates demand for tangible medical and nonmedical products. Although personnel, nursing, and doctor pay accounts for a large portion of a hospital's operating budget, yet costs related to inventory, logistics, and administration processes are withal significant. Studies [1–3] have shown that thirty% to 40% of infirmary spending is invested in various logistical activities, such that approximately half of this corporeality derives from the directly cost of acquiring materials and services and the other half from the cost of managing them after conquering. Present, healthcare providers are seeking to improve their logistics and supply chain direction in social club to reduce the current high healthcare cost.

Literature offers many studies most logistics in healthcare. Jørgensen et al. [iv], Ferretti et al. [5], and Volland et al. [6] revealed several focus areas in the healthcare logistics' studies including logistics activities (supply and procurement, inventory management, transportation, and distribution and scheduling), holistic supply chain management, lean logistics, patients' logistics, and logistics technology. In the search for ways to better healthcare logistics, academics and practitioners take looked into methodologies that have been applied successfully in other sectors, especially the manufacturing sector. Although Half dozen Sigma has been applied successfully in the manufacturing sector as reported in a recent literature review study [vii], the methodology is less frequently applied in healthcare logistics. Limited research has evaluated whether the Six Sigma methodology transfers successfully and what touch on the methodology has on for example productivity, costs, and quality of service. This paper makes two contributions. Start, this enquiry proposes how 6 Sigma can be employed to meliorate healthcare logistics. Secondly, this newspaper introduces a novel approach to determine the critical Vi Sigma projects which provide maximum benefits to the healthcare organization. The approach is based on defining Importance Alphabetize that correlates criticality, cost, and performance of products in healthcare logistics.

This paper is organized as follows. Section ii provides a literature review of Six Sigma and its application in healthcare logistics, followed past a literature review of what healthcare logistics involves. In Section 3, the proposed framework for applying Six Sigma in healthcare logistics is presented in detail. In Section iv, an empirical case study from healthcare is given to explore the effectiveness of the proposed framework. In the last section, the findings of this research are discussed.

ii. Literature Review

two.1. Half-dozen Sigma

Half-dozen Sigma was originally developed in the mid-1980s by Motorola every bit a quality control method to foreclose defects in their manufacturing procedure [viii] and has been evolved into a project-driven direction approach to meliorate the organisation's products, services, and processes past continually reducing defects in the organization [ix]. Half dozen Sigma is defined in a variety of ways by several authors. From a statistical perspective, Half-dozen Sigma is defined by Motorola as a quality improvement program with a goal of reducing the number of defects to equally low equally 3.4 parts per million opportunities [x]. From a business organisation perspective, Half-dozen Sigma is defined equally a business strategy used to improve business profitability and to amend the effectiveness and efficiency of all operations to come across or exceed the customer's needs and expectations [eleven].

Zu et al. [12] identified iii practices that are critically associated with Six Sigma implementation: Half-dozen Sigma role structure, Vi Sigma structured comeback procedure, and Vi Sigma focus on metrics. The role construction of Six Sigma is often referred to as the "belt organization." Half-dozen Sigma identifies several key roles for its improvement specialists: champions, primary blackness belts, black belts, and green belts [13, 14]. Those specialists are assigned different levels of roles and responsibility and work together in a hierarchical coordinated mechanism beyond multiple organizational levels to achieve the Six Sigma goals.

Six Sigma uses two major structured methods for improvement known as DMAIC (define-mensurate-analyse-improve-control) and DMADV (define-measure-analyse-design-verify). The DMAIC method is used for procedure comeback [xv], while the DMADV is used for production and process design [16]. The highlight of the DMAIC method is the five-phased methodological framework that guides in conducting the improvement projection [17, 18]. In the starting time four phases, diverse managerial and statistical tools are used in a manner that makes it like shooting fish in a barrel to understand the process and its issues besides every bit finding the proper root causes of the problem and coming upward with the proper solutions. The terminal stage ensures that the root causes of the problem seize to exist and the process will never go back to its old ill state.

two.2. Six Sigma Application in Healthcare Logistics

The application of Six Sigma in healthcare logistics had very little attention in exercise. Jin et al. [19] presented a detailed instance study of applying the principles and procedures of 6 Sigma and Lean thinking in designing and operating a healthcare logistics heart in North Mississippi. Chicken et al. [twenty], through brief instance studies, highlighted some representative Half dozen Sigma projects conducted in diverse departments at New York–Presbyterian hospital. Their study described how an inventory management project that used Lean Six Sigma methodology resulted in the identification and removal of expired medication and products. Lifvergren et al. [21] described the lessons learned from 22 Six Sigma projects implemented by a Swedish infirmary—ii of which were related to logistics. Their study provided a summary of the project purpose, whether the projection reached its intended results and the cyberspace cost savings in the showtime twelvemonth after the implementation of the suggested solutions. A critical analysis overview of the important publications is presented in Tabular array 1.

Table 1

Overview of important publications.

Publication	Publication approach	Six Sigma implementation focus areas	Six Sigma methodology implemented	Six Sigma tools and techniques used	Six Sigma implementation benefits
Jin et al. [xix]	Detailed case written report on the application of Half dozen Sigma and Lean in healthcare logistics	Warehouse management	DMADV (define, measure, analyse, design, and verification) methodology and Lean thinking principles	(i) Survey (two) Disquisitional to quality (CTQ) parameters (three) Value stream mapping (iv) Fishbone diagram (v) Lean thinking tools (smoothing menstruation and removing nonvalue-adding activities)	(i) Meliorate storage management (ii) Better use of space (iii) Improved workspace (four) Organisation and cleanliness (v) More timely and efficient delivery of right supplies to the right patients (half dozen) Tracking and reducing waste (vii) Cost savings

Chicken et al. [20]	Cursory case studies on the awarding of Six Sigma and Lean in clinical, operational, and service areas in healthcare	(i) Isolation direction (clinical area) (two) Inventory management (operational area) (iii) Patient room turnaround fourth dimension (service surface area)	DMAIC (define, measure, analyse, improve, and command) methodology and Lean thinking principles	(i) Priority ranking for project selection (ii) Voice of customer (VOC) (iii) Survey (4) Process menstruation map (v) Lean techniques (sort, straighten, sanitize, standardize, and sustain) (half dozen) Cause-and-effect assay	(i) Reduced operating expenses (ii) Reduced patient length of stay (three) Improved throughput (patient flow) (iv) Compliance and total accreditation (5) Extended expertise (vi) External validation through awards

Lifvergren et al. [21]	Description of lessons learned from the application of Six Sigma projects in different clinical areas in healthcare	Healthcare quality, patient prophylactic, and resource utilization in dissimilar clinical areas (1 of which is patients' logistics)	DMAIC (define, measure, analyse, improve, and control) methodology		(i) Reducing unwanted variation in care processes (ii) Increased patient condom (3) Indirect quality improvement (iv) Optimize resource utilization (v) Cost savings

two.3. Healthcare Logistics

In healthcare, logistics systems are circuitous and more than problematic to manage compared to other sectors. This is due to the wide product range, the high value of products involved, and the perceived demand to supply a very high level of services for most items [22]. The wide variability in production ranges is acquired by the high differentiation among bachelor products, the subjective role of physicians in choosing these products [23], and nearly importantly, the big volume of diverse support services required to deliver the stop product–patient care. Moreover, healthcare providers are unable to predict patient mix and hence unable to predict and control the need of products [3].

Products used in hospitals tin be classified into categories based on the level of criticality to patient care. Although disquisitional items constitute a small number of items, the majority of the total inventory investment is in critical items—effectually 60% [24]. Critical items are ordinarily extremely expensive, have short shelf-life, and/or require expensive storage facilities on-site. What makes hospital logistics more than circuitous is the criticality of some items used and the patient's life-threatening situations that could happen due to the unavailability of these items in stocks. This distinctive feature of hospital logistics may require different management policies than those used for other industries logistics systems. Al‐Qatawneh and Hafeez [25] proposed a multicriterion disquisitional-to-life classification technique for managing inventory in a healthcare supply chain. Their findings suggest that the proposed nomenclature allows for assigning a particular service level to each item to ensure the availability of items that are disquisitional to patient life and deduce the optimal inventory level.

The literature of Six Sigma awarding in healthcare logistics showed that no work is bachelor that considers explicit interrelations between criticality of items and problem definition in a Six Sigma project. To answer this deficiency, this paper proposes the apply of an Importance Alphabetize that correlates criticality, cost, and functioning to select the 6 Sigma projection.

3. Proposed Framework

Cost and customer satisfaction are two key factors that are considered when taking managerial decisions by healthcare logistics professionals. The criticality level of an item affects cost and client satisfaction in a conflicting fashion. For instance, for an item that is accounted disquisitional, the availability of such an detail is more important than the expenses of procurement, storage, and transportation. On the other paw, cost optimization tends to minimise on-hand stock. Therefore, ii competing objectives have to exist satisfied in a manner that minimises the cost while guaranteeing no stock-out incidents, peculiarly for critical items. And so, for a 6 Sigma projection focusing on healthcare logistics, the objective can be minimising the total logistics price while maintaining a high performance level.

When selecting the Half dozen Sigma project, we correlate criticality, toll, and performance by defining Importance Index (II) as follows:

$\begin{matrix} Importance Index = (F 1 \times criticality level) + (F 2 \times toll level) + (F 3 \times functioning level), \end{matrix}$

(one)

where 0 ≤ Fone ≤ i, 0 ≤ F2 ≤ 1, and 0 ≤ F3 ≤ 1.

F1, F2, and F3 are determined for every item in the stock, depending on the gap between the current state of affairs and the state of affairs the hospital wants to achieve, such that the larger the gap, the higher the value of the cistron F. The factor F will have a value of zero if the performance level equals its target and will have a value of one for the highest possible gap betwixt the performance level and its target.

Criticality level indicates criticality of the item based on a criterion decided past the voice of the customer (VOC), and it equals ane for noncritical items, 5 for medium critical items, and nine for highly critical items. The estimation of the level is washed twice, once past the process owners and the 2nd past the Six Sigma team.

Cost level indicates the cost of the item based on the critical to quality (CTQ) parameter decided past VOC, and it equals 1 for low cost items, five for medium toll items, and nine for items with loftier price.

Performance level indicates the performance of the item based on a CTQ parameter decided by VOC, and information technology equals 1 for excellent performance, 5 for medium performance, and 9 for poor operation. The estimation of the level is done twice, once by the process owners and the 2nd past the Six Sigma team.

The project with highest Importance Index (II) value volition exist selected. The Ii values tin range between 0 (for a project on an detail that is on target for all the three levels mentioned) and 27 (for a project on an item that has its operation characteristic at the poor finish of the calibration, is highly critical to patients, is a costly item, and is off target for all the three levels).

Notice that a Six Sigma projection will try to decrease the value of Two. The criticality value is difficult to minimise, still, it can be minimised through creating alternatives, minimising the effect of stock-out, shortening the time of replenishment, etc. The operation level and cost of operation are typical Six Sigma comeback projects, where projects are conducted to reduce the gap betwixt the current and the targeted situation.

In the improve phase when selecting between alternatives, we select the alternative that is expected to take the greatest impact on decreasing the Two value after implementing the new process changes. As well, the Six Sigma projection success can be measured by the corporeality we reduce the value of II in the project.

The intriguing role of the proposed methodology is that it can exist used to bargain with various areas of healthcare logistics. These areas vary from inventory control to transportation, warehousing, supplier direction, customer service, and demand forecasting.

Table 2 reveals our stride by step framework that can exist used finer to tackle healthcare logistics. The framework is a proposed modified 6 Sigma methodology that fits healthcare and its logistics organisation.

Tabular array ii

Proposed framework for applying 6 Sigma in healthcare logistics.

Phase	Steps	Description
Define	(1) Fully define the procedure	This is done past defining the logistics activities performed to obtain the medical product and to ensure its availability, for example, purchasing, transportation, warehousing, and inventory control
	(two) Ascertain the parameters that will exist used to assess process performance	Examples of procedure parameters may include (i) Boilerplate inventory level (ii) On-time delivery (iii) Actual time for stock replenishment (four) Number of stock-out incidents (five) Number of expired property items (six) Transporting cost (vii) Actual time to get production from warehouse or store (viii) Number of products damaged in handling or delivery (ix) Volatility and variability of need (x) Shelf-life (xi) Suppliers reliability (xii) Inventory price (xiii) Full logistics toll
	(3) Define the parameters that will be used to assess criticality level of the product	Examples of criticality parameters may include (i) Production availability at the nearest distributor/manufacturing warehouse (ii) Time needed to become production from the nearest benefactor warehouse (iii) Number of alternative products in the hospital or local market (iv) Effect of stock-out incidents or bug caused by stock-out condition
	(4) Define the parameters that will exist used to assess production price level	Examples of price parameters may include (i) Purchasing cost (ii) Ordering toll (iii) Holding cost (iv) Transportation price
	(v) Assess performance, criticality, and cost by process owners or management	(i) Decide current process performance (ii) Determine current process criticality (iii) Make up one's mind the cost levels with the help from accounting section (iv) Assess targeted operation, criticality, and price, and and then measure the gap between the current situation and the target (evaluate the F factors) (v) Summate the Importance Index to select the project with more pain
	(6) Define project goals	(i) Desired improvement to Importance Index value (two) Whatever other ancillary goals

Measure	(ane) Map electric current process	This is a squad work that may use some of the post-obit tools: (i) Process flow nautical chart (ii) Input/output analysis
	(two) Measure performance parameters	(i) Six Sigma project squad studies the every bit-is procedure and collects operation parameters data (ii) Plot the collected performance as-is data using simple statistical tools^∗
	(3) Measure criticality parameters	(i) Six Sigma squad studies the as-is procedure and collects criticality parameters information (ii) Plot the collected criticality every bit-is information using unproblematic statistical tools∗
	(four) Measure cost parameters	(i) Six Sigma squad studies the every bit-is procedure and collects cost parameters data (ii) Plot the collected toll as-is data using simple statistical tools∗
	(5) Calculate Importance Index	(i) Using targeted performance, criticality, and cost, measure the gap between the current situation and the target (evaluate the Fsouthward) (2) Discover the 2 value past the 6 Sigma team and verify the project selected was the right i

Analyse	(1) Improve the procedure	Carefully observe the as-is process and use value stream analysis to improve it, this may include: (i) Eliminate or minimise non-value added activities (ii) Develop and utilize standards (3) Move inspection points forward or eliminate them
	(2) Find root causes affecting criticality, operation and cost	Use tools similar Pareto charts or fishbone diagram to determine significant causes responsible for the low performance level, high cost level, and high criticality level
	(iii) Develop alternative solutions	Suggest process changes alternatives needed to improve current situation of the criticality, performance, and cost levels

Improve	Implement the new improved process	(a) Study the Importance Index expected enhancement for each alternative (b) Perform take chances assay for each alternative (c) Utilize prioritization matrix to list features of each alternative. Every feature should have weight related to the item's criticality and cost (d) Implement the best alternative that will have the largest upshot on reducing Two

Control	Define and implement controls to guarantee the procedure will not go back to its unhealthy country.	(a) Write quality manuals (b) Set primal functioning indicators to measure performance and a plan to use them (c) Employees training program to maintain skills and transfer cognition

four. Case Written report

Our example study organization is a general hospital from the individual sector in Jordan. Due to confidentiality, nosotros will refer to it as the case hospital. The following sections volition discuss in particular the application of the proposed framework unlike steps shown in Table ii at the case hospital.

4.1. Ascertain Phase

4.1.1. Fully Define the Process

A articulate knowledge of the example hospital'southward logistics system was caused. The case hospital conducts ii main logistics activities: warehousing and inventory management. The case hospital has iv chief warehouses: medical supplies warehouse, nonmedical supplies warehouse, maintenance warehouse, and pharmaceutical supplies warehouse. In improver to the 4 main warehouses, at that place is a secondary warehouse located at each department, which volition be referred to as "section warehouse." The department warehouse contains a one calendar week stock of near frequently used items by the department. In this paper, the application of 6 Sigma is done only on the medical supplies warehouse.

4.1.2. Define the Parameters That Volition Exist Used to Assess the Process Operation

Determining the CTQ parameter that will be used for assessing the logistics arrangement performance for medical supplies was based on the voice of the customer. A questionnaire was designed, and a survey was conducted which included internal customers (warehouse keepers) from the targeted warehouse, and iv other secondary warehouses included emergency room (ER) department warehouse, operations room (OR) department warehouse, cardio department warehouse, and extension ward warehouse. The total number of respondents was five warehouse keepers. The survey required procedure owners to rank the suggested CTQs in the questionnaire every bit high, medium, or low in terms of importance in performance cess. Then, a unproblematic calibration system was used for ranks, such that (5) indicated high importance, (3) medium importance, and (1) low importance. Tabular array 3 shows the suggested CTQs and their boilerplate rank according to the survey findings. Tabular array iii shows that "boilerplate inventory level" has the highest average CTQ rank of 4.half dozen which makes information technology the most suitable CTQ to appraise the logistics system performance based on VOC.

Table 3

Suggested criteria and average rank of CTQ questionnaire.

Potential CTQ	Average CTQ rank
Average inventory level	4.6
Inventory holding costs	iv.2
Number of expired items	four.2
On-time delivery	4.2
Supplier reliability	4.2
Safety stock level	3.8
Number of stock-out incidents	3.viii
Actual time to become product from warehouse	3.8
Effect of redundant purchases	3.0
Variability of demand	2.8
Shelf life	2.half-dozen
Transporting costs	1.4

4.1.3. Define the Parameters That Will Be Used to Appraise the Criticality Level of Products

This pace as well was based on the VOC. Another questionnaire was designed, and a survey was conducted which included internal customers (doctors, nurses, and warehouse keepers) from different departments; this survey had a total of 16 respondents. The survey required customers to rank the suggested criteria in the questionnaire every bit loftier, medium, or low in terms of suitability for criticality assessment. And then, a simple scale organization was used for ranks, such that (5) indicated loftier suitability, (3) medium suitability, and (1) low suitability. Table iv shows suggested criteria and their boilerplate rank co-ordinate to the survey findings. Table 4 shows that both "fourth dimension needed to get product from the nearest distributor warehouse" criterion and "consequence of stock-out incidents or problem caused by stock-out condition" criterion take the highest boilerplate rank of iv.1 which makes them the most suitable criteria for assessing the criticality of medical supplies based on VOC.

Tabular array four

Findings of VOC used to determine criticality categorization criteria.

Suggested criteria	Average criteria rank
Effect of stock-out incidents or problems caused by stock-out atmospheric condition	4.1
Fourth dimension needed to get the production from the nearest distributer warehouse	4.1
Availability of product in the nearest distributer or manufacturing warehouse	4.0
Ease of acquiring the item during diagnosis or operation from store	3.8
Accessibility of item at store after working hours	3.5
Number of alternative products in the hospital or local market	3.3
Unavailability of item due to maintenance or cleaning	3.0

4.one.4. Ascertain the Parameters That Volition Exist Used to Appraise the Cost Level of Products

Determining the parameter that will be used for assessing the cost of medical supplies volition exist based on item purchasing cost. A simple scale system was used for ranks, such that (five) indicated high cost, (3) medium cost, and (1) depression toll.

iv.1.five. Assess Performance, Criticality, and Cost by Procedure Owners or Direction

All items at the medical supplies warehouse were assessed according to the "average inventory level" parameter that defines the performance according to VOC. The warehouse keepers (the process owners) classified the items equally having high performance, medium performance, and depression performance. Also, the keepers estimated the desired targeted performance for each item and measured the gap. High-performance items are items whose average inventory is well matched to the need. Medium-performance items are items whose average inventory is less matched to demand. While, low-performance items are items whose average inventory is much higher than the quantity needed to encompass the demand. A simple scale organisation was used to rank items in terms of performance level, such that (1) indicated high operation level, (5) medium performance level, and (9) depression functioning level. Then, depending on the gap between the performance level and desired target level, the level was multiplied past the factor F3, such that the larger the gap, the higher the value of the factor F3. The factor F3 has a value between zero and one.

Based on VOC, 2 criteria were chosen to exist used for assessing the criticality of medical supplies, the criteria are "time needed to get production from the nearest distributor warehouse" and "effect of stock-out incidents or problem acquired by stock-out condition." All items at the medical supplies warehouse were checked for criticality with the process owners (doctors and nurses), so classified into loftier, medium, or depression criticality level, and finally procedure owners estimated the desired targeted criticality for each particular and measured the gap. High-criticality items were those for which a stock-out condition was life-threatening for the patient. Medium-criticality items had less effect on the patient in case of a stock-out but did bear upon the diagnosis or treatment. Low-criticality items were of almost no effect in case of stock-out except the inconveniences of the patient. A simple scale arrangement was used to rank items in terms of criticality such that (9) indicated high criticality, (5) medium criticality, and (1) low criticality. Then, depending on the gap betwixt the criticality level and desired target level, the level was multiplied by the factor F1, such that the larger the gap, the higher the value of the gene F1. The gene F1 has a value betwixt nada and one.

Cost indicators were based on purchasing cost data that were acquired from the procurement section, so, process owners estimated the desired targeted toll for each item and measured the gap. A simple scale system was used to rank items in terms of cost such that (9) indicated high cost, (v) medium cost, and (1) low cost. And then, depending on the gap between the cost level and desired target level, the level was multiplied by the gene F2, such that the larger the gap, the higher the value of the factor F2. The factor F2 has a value between zero and one.

The Importance Index was calculated for all items at the medical supplies warehouse depending on the process owners' evaluation of the 3 levels and the gap from target assessment. As a sample for sit-in in this paper, Table five shows the Importance Alphabetize calculations for some of the items. Note that the ii items with the highest II value among all items were included in the sample in Table 5. These two items are "Intra-aortic balloon" and "Seroquel 300 mg tablet."

Table 5

Importance Alphabetize calculated for sample items.

Item name	F1	Criticality level	F2	Cost level	F3	Performance level	Importance Index (Two)
Syringe 5 ml	0.7	five	0	1	0	1	3.5
Crepe bandage half-dozen	0	ane	0.half dozen	v	0	one	3
Cannula 20	0.vii	five	0	1	0	i	three.five
Umbilical cotton tape	0.vii	5	0.vi	5	0.5	5	ix
Latex gloves	0.seven	5	0	ane	0.5	5	6
N/S 500 ml Four fluid	1	nine	0	1	0.five	five	xi.5
Surgical blade 10	0.seven	5	0	1	0.v	5	half dozen
Gauze bandy iv × 4	0	ane	0	1	i	9	ix
Seroquel 300 mg tablet	1	9	0.6	five	1	9	21
Intraaortic airship	1	9	ane	9	i	ix	27

4.ane.vi. Define Project Goals

The project goal is to reduce the II value for Intra-aortic balloon and Seroquel 300 mg tablet.

iv.2. Measure Stage

4.2.1. Map Current Process

Based on the acquired knowledge in the ascertain stage, the information and material flow chart of the logistics system at the instance hospital were developed as shown in Figure one.

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Logistics activities procedure map at the medical supplies warehouse.

4.2.two. Measure out Process Performance Parameters

All items at the medical supplies warehouse were assessed by the Half dozen Sigma projection team according to the "average inventory level" parameter that had the highest average CTQ rank as constitute past VOC and using the aforementioned calibration system used by the process owners.

4.2.3. Measure Process Criticality Parameters

All items at the medical supplies warehouse were checked for criticality past the Half-dozen Sigma project team and and then classified into high, medium, or low criticality level using the same calibration organization used by the procedure owners.

4.2.iv. Measure out Process Price Parameters

The price of all items at the medical supplies warehouse was assessed by the Six Sigma project team using the aforementioned scale system used by the process owners.

4.2.5. Calculate Performance Alphabetize

Using the output of the three steps above, the levels were fix, and factors were then estimated depending on the desired targeted levels provided by process owners in the define stage. The Importance Index was calculated for all items at the medical supplies warehouse past the Half dozen Sigma project team. Again, as a sample for demonstration in this newspaper, Table 6 shows the Importance Index calculated past the Six Sigma team for the same sample of items in Table v. As a result of this step, the 2 values for "Intra-aortic balloon" and "Seroquel 300 mg tablet" are yet the highest amidst all items. Therefore, the projection selection done during the ascertain phase is still valid, and the Six Sigma team proceeded the work with the defined project (reduce the II value for Intra-aortic balloon and Seroquel 300 mg tablet).

Table 6

Importance Alphabetize calculated for sample items.

Item name	F1	Criticality level	F2	Price level	F3	Functioning level	Importance Index (II)
Syringe 5 ml	0.vii	five	0	i	0	1	3.five
Crepe cast 6	0	one	0.vi	5	0	i	3
Cannula xx	0.7	ix	0	1	0	1	half dozen.iii
Umbilical cotton tape	0.vii	1	0.vi	five	0.5	5	vi.ii
Latex gloves	0.7	v	0	ane	0.v	v	6
N/Southward 500 ml Iv fluid	i	9	0	one	0.5	5	11.5
Surgical blade 10	0.7	5	0	1	0.5	5	6
Gauze swap 4 × 4	0	1	0	one	1	9	9
Seroquel 300 mg tablet	one	9	0.six	5	i	9	21
Intraaortic balloon	one	9	1	nine	ane	5	23

4.3. Analyse Phase

4.3.i. Improve the Process

The Six Sigma team carefully observed the as-is process and used value stream analysis to ameliorate information technology, which included eliminating and minimising nonvalue-added activities, developing and moving inspection points frontward, or eliminating them. Figure ii shows the improved process. Changes done to reduce the process complication included:

The check of the items' quantity on hand is done subsequently giving the medicine to patients rather than a weekly bank check. This eliminated the possibility of having stock outs as the cheque is done afterwards each prescription is given.
Rather than having the chief warehouse keeper fill the purchasing asking and so send information technology for the warehouse manager for approval, a coming together is conducted were the warehouse manager approves the requests and so the keeper fills them and sends them to the purchasing section.
Shipment inspection is done at the supplier side to relieve time.

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iv.3.2. Determine Potential Causes for the Problem on Hand

A brainstorming session was held forth with the example hospital staff within the related departments (the cardio department staff, warehouse officer, and material management officeholder) to put down all the possible causes that lead to having such a loftier Two value for the "intra-aortic balloon." It was agreed that the main cause for such low operation level causing a high II value was the fact that the "intra-aortic balloon" has been replaced past new medications that are easier on the patient and more toll justified. Therefore, the "intra-aortic balloon" became an obsolete item that is to be used but in rare emergency situations when no other medication would salve the patient's life.

Another brainstorming session was held along with the case hospital staff within the related departments (the neurology department staff, warehouse officer, and material direction officeholder) to put down all the possible reasons that lead to having such a high II value for the "Seroquel 300 mg tablet." A cause-and-outcome diagram was developed to summarise the possible causes of having low functioning level that is causing a high Ii value for the "Seroquel 300 mg tablet" as shown in Figure three.

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Cause-and-upshot diagram showing possible causes of the depression performance level for Seroquel 300 mg tablets.

The whole moving picture of this problem developed from further analysis of the causes listed in Figure 3 was summarised equally follows:

"Seroquel 300 mg tablet" was the favourite medication for a big number of neurology physicians and the demand for it was high. Since the cost of "Seroquel 300 mg tablet" is rather high, the supplier offered a good bargain based on quantity discount principle. The purchasing officer saw this to be a good run a risk of saving on the long run and agreed to the supplier's bargain. Before the last lot of "Seroquel 300 mg tablet" was consumed, a new generation of the same brand of "Seroquel 300 mg tablet" was available on the market place. Because the new generation is an improved 1, information technology became the physicians' new favourite. At nearly the same time, a local less-expensive alternative to "Seroquel 300 mg tablet" was bachelor on the market. Since this alternative was less expensive and approved by the Ministry of Health, many physicians switched to prescribing it.

All the to a higher place causes combined led "Seroquel 300 mg tablet" to have a depression performance level (i.e., its average inventory is much higher than the quantity needed to cover the demand). However, it was agreed that the main cause of this problem is purchasing big quantities of "Seroquel 300 mg tablet" at quantity disbelieve.

four.3.3. Develop Alternative Solutions for the Problem

After studying the cases that led to having a high 2 value for "Seroquel 300 mg tablet," the Half-dozen Sigma team developed some suggested solutions to reduce the high II value for this detail.

One of the suggestions was to fix a "sale representatives' affair office" where his/her principal task is to receive offers from sales representatives of medical supplies without representatives approaching physicians straight. This is hoped to guarantee that physicians' choices of medical supplies are purely according to the medical benefits regardless of the supplier-physician relationship.

The residuum of improvement options were directly related to the electric current policies used for material direction. One of the suggestions was to ready a policy concerning checking up for new development on current medical supplies or alternatives each fourth dimension a purchase is done to reflect that on the quantity purchased. Another suggestion was to gear up up a policy to buy items depending on demand forecasting rather than on offered discounts. The infirmary is recommended to conduct need forecast for all important items stored and lodge them depending on forecasted demand. The last suggestion was to implement the start-in-commencement-out (FIFO) method within the warehouse and non to purchase new products while still holding considerable stock from it, from its equivalents or from its older version products.

4.iv. Ameliorate Phase

The new improved process (developed in Department 4.3.i) was implemented at this phase. Also, at this stage and subsequently selecting the alternatives to be implemented for reducing the Ii index, the 6 Sigma team met with the process owners; explained the alternatives, the selection criteria for the best alternative and the selected alternative. The selected alternative was then implemented and the improvement resulted from its implementation was measured. Mainly, the implementation of selected alternative resulted in reducing the gap betwixt the functioning level and desired target level which in turn resulted in reducing the II value for both: Ii for "Intra-aortic balloon" and "Seroquel 300 mg tablet" were reduced by 25% and 33%, respectively. Even though customer satisfaction rates were not compared before and afterward the project, it is expected to see a marked improvement as well.

4.5. Control Phase

Six Sigma command stage ensures that all root causes of the trouble seize to exist and that the process will never get dorsum to its one-time state. For this purpose, a guide with all the suggestions to a higher place was created for all warehouses' staff members and for the material direction staff and an evaluation organization was set to written report employees' compliance with the guidelines.

5. Conclusions and Future Piece of work

Vi Sigma is a pioneer problem-solving technique and a leading process comeback method. We presented how it can be used effectively to deal with healthcare logistics issues, including deciding the major problems to be solved and solving them. We too showed that some tools used for manufacturing applications might not be very useful in service applications such every bit healthcare logistics without modifications, so we congenital a framework that could exist used to select and implement 6 Sigma projects.

This work revealed new contributions on all the published work peculiarly those shown in Table 1 in many ways: First, it reveals a new practical method to select projects based on criticality. Second, it showed how we can include competing functioning measures in one calculated measure we called importance index. Third, it revealed a framework that is in line with Six Sigma teachings and with decision maker's priorities.

This article paves the road for research to elaborate on ways to use Six Sigma in the surface area of improving healthcare logistics, specially that this area of research is almost untouched thus far. This enquiry can exist completed and complimented by others who can use this methodology, conduct calculations of the importance gene, check the model validity and implement it in other countries and different types of hospitals, and report instance studies in future inquiry.

For infirmary management, this work reveals the idea of prioritization of all stocked items based on criticality, toll, and performance. Hospitals should use the 2 calculations for all items in stock in order to establish current-status review and continuous operation reviews for all items at stocks.

Half dozen Sigma is a management tool. Hospital management may differ from that of a typical company; thus, future inquiry may also reveal obstacles and opportunities when dealing with hospital management while implementing a Six Sigma project in healthcare logistics.

Data Availability

The information used to back up the findings of this study take non been made available because they are confidential to the case study hospital.

Conflicts of Interest

The authors declare that at that place are no conflicts of interest regarding the publication of this paper.

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Source: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6393908/