Value Stream Mapping for Endoscopy Units: From Referral to Completed Procedure Without the Scope Turnaround Drag

In the realm of healthcare operations, a patient may experience a long delay even when the clinical procedure itself takes less than an hour. Endoscopy units are particularly sensitive to this problem because patient flow, referral administration, procedure-room capacity and endoscope reprocessing must operate as one connected system.

Value Stream Mapping (VSM) makes that system visible. It follows the flow of the patient, information, staff, equipment and scopes from the initial referral through to the completed procedure and the return of a clean, dry and available scope.

The purpose is not to make staff work faster at every step. The fundamental purpose is to identify where value is created, where work waits, where handoffs fail and where the decontamination process constrains overall capacity.

This worked example uses a hypothetical endoscopy unit with:

• 420 referrals per month
• 11 working days from referral receipt to procedure
• 190-minute dirty-to-ready scope turnaround against a 45-minute target
• Six washer-disinfector cycles per day
• Four decontamination FTEs

All proposed changes must be validated against local infection prevention requirements, endoscope manufacturer instructions for use, workforce rules and applicable accreditation standards.

1. Define the Endoscopy Value Stream

The scope of the map should be broad enough to reveal system constraints but narrow enough to produce actionable improvements.

Start point

Referral received and logged

End point

Procedure completed, patient discharged or transferred to the next required pathway, report initiated, and the scope cleaned, dried, tracked and available for the next procedure

The map should include four connected flows:

1. Patient flow: referral, triage, booking, preparation, arrival, procedure, recovery and discharge.
2. Scope flow: used scope, transport, manual cleaning, washer-disinfector, drying, storage and allocation.
3. Information flow: referral status, urgency, appointment instructions, consent, procedure details and reporting.
4. Staff flow: movement between rooms, recovery, administration and decontamination.

The patient is the primary customer. Referrers, clinicians, nurses, schedulers, decontamination staff and hospital leaders are also important stakeholders. Voice of the Customer requirements may include timely access, clear instructions, safe care, reliable results and minimal avoidable waiting.

2. Current-State Map: Follow the Work, Not the Organisation Chart

The current-state map should be created through direct observation, timestamps and staff interviews. Do not rely only on standard operating procedures because the documented process and the process actually followed may differ considerably.

Patient pathway

The unit receives 420 referrals per month. Assuming 20 working days per month:

[
420 \div 20 = 21 \text{ referrals per working day}
]

At an 11-working-day referral-to-procedure lead time, the average referral queue is approximately:

[
21 \times 11 = 231 \text{ referrals in the system}
]

A simplified current-state sequence may look like this:

The pre-procedure waiting time totals approximately 11 working days. The active work before and during the patient pathway is:

[
8 + 12 + 10 + 20 + 15 + 35 + 45 + 10 = 155 \text{ minutes}
]

Using 480 working minutes per day, the referral-to-procedure lead time is:

[
11 \times 480 = 5,280 \text{ minutes}
]

Therefore, the approximate value-added-to-lead-time ratio is:

[
155 \div 5,280 \times 100 = 2.9%
]

This does not mean that the remaining time is unnecessary. Clinical prioritisation, preparation and recovery are essential. It does show that the unit has substantial opportunity to reduce queue time, rework and handoff delays without reducing safe patient care.

Scope turnaround pathway

The scope pathway is often mapped separately, even though it directly affects patient throughput.

A worked current-state scope map could be:

The unit runs six washer-disinfector cycles per day. If approximately 21 scopes require processing daily, the average load is:

[
21 \div 6 = 3.5 \text{ scopes per cycle}
]

The four decontamination FTEs are not necessarily the sole cause of the delay. The constraint may be the interaction between collection timing, manual cleaning sequence, washer availability, drying capacity, transport and information visibility.

The critical observation is that a scope may be physically clean before it is visible as available. In Lean terms, the delay can exist in the queue, the handoff or the information system rather than in the disinfection cycle itself.

3. Identify the Eight DOWNTIME Wastes

The eight DOWNTIME wastes provide a practical structure for analysing the map.

• Defects: Incomplete referrals, incorrect patient details, missing consent information, unsuitable preparation or incomplete scope tracking that creates rework.
• Overproduction: Booking investigations before triage is complete, preparing equipment before the procedure type is confirmed or creating duplicate reports.
• Waiting: Patients waiting for triage, appointments, pre-assessment, recovery discharge, a clean scope or a report signature.
• Non-utilised talent: Experienced nurses, technicians or schedulers spending time searching for information instead of using their knowledge to improve flow.
• Transportation: Unnecessary movement of scopes, paperwork, patients, equipment or consumables between separated locations.
• Inventory: Referral backlogs, work in process, unallocated scopes, excess consumables and reports awaiting completion.
• Motion: Staff walking to find equipment, locate documentation, check scope status or obtain missing supplies.
• Extra-processing: Re-entering referral information, repeating patient questions, duplicating documentation or performing approval steps that do not change the clinical decision.

A focused waste walk should record the frequency, duration and consequence of each example. A ten-minute delay repeated across 21 patients per day represents:

[
10 \times 21 = 210 \text{ minutes per day}
]

That is 3.5 hours of daily capacity consumed by one recurring delay.

4. Build the Future-State Map

The future state should connect patient demand to available capacity and create a visible pull system for scopes and appointments.

Patient-flow improvements

1. Standardise referral intake with required fields, urgency definitions and a single visible triage worklist.
2. Introduce daily triage and booking control rather than allowing referrals to accumulate between review sessions.
3. Use level-loaded scheduling based on procedure type, staffing, recovery capacity and scope availability.
4. Complete pre-assessment earlier using standardised preparation questions and clear escalation rules.
5. Create standard work for room start-up, patient changeover and discharge.
6. Use visual management to show referrals awaiting triage, patients ready for the next step and appointments at risk.

Scope-flow improvements

Within local safety and manufacturer requirements:

• Use a clear dirty-to-decontamination pull signal.
• Create a defined first-in, first-out queue.
• Standardise point-of-use pre-cleaning and transport handoffs.
• Display washer status, cycle completion and scope availability in real time.
• Align decontamination staffing with procedure-list demand rather than fixed assumptions.
• Separate “clean and processing” from “clean and available” status.
• Use a daily huddle to identify anticipated scope shortages before lists begin.

The objective is not simply to increase the number of washer cycles. It is to reduce queue time and synchronise scope readiness with the patient schedule.

5. Current-State Versus Future-State Targets

The following targets illustrate a measurable future state for the hypothetical unit.

The target scope turnaround represents a reduction of:

[
190 – 45 = 145 \text{ minutes}
]

That is a 76.3% reduction in elapsed turnaround time. This should be treated as a controlled improvement target, not a reason to bypass validated reprocessing requirements.

6. A 90-Day Kaizen Sequencing Plan

Days 1–15: Define and Measure

• Confirm the value-stream boundaries and project charter.
• Form a multidisciplinary team covering referrals, clinicians, nursing, scheduling, portering and decontamination.
• Observe at least 30 patient journeys and 50 scope turnarounds.
• Validate timestamps, definitions and data ownership.
• Confirm the Voice of the Customer and Voice of the Business requirements.

Days 16–30: Analyse the Constraint

• Create a Pareto chart of referral delays, cancellations and scope waits.
• Use 5 Whys and a cause-and-effect diagram for the 190-minute turnaround.
• Stratify data by procedure type, day, shift, washer, room and staffing pattern.
• Review whether the bottleneck is capacity, sequencing, information visibility or variation.
• Complete a measurement-system check so timestamps are reliable.

Days 31–45: Improve Referral and Patient Flow

• Pilot a standard referral template.
• Establish daily triage windows and escalation rules.
• Introduce standard work for booking, pre-assessment and patient changeover.
• Test a visual board showing demand, capacity and risks.
• Measure lead time, rework and patient waiting after each PDSA cycle.

Days 46–60: Improve Scope Turnaround

• Pilot a dirty-scope pull signal and visible washer-status board.
• Standardise transport routes, handoff points and tracking.
• Align the four decontamination FTEs to observed demand peaks.
• Test a controlled schedule that synchronises scope availability with procedure lists.
• Verify every change against infection prevention policy and equipment instructions.

Days 61–75: Integrate and Stress-Test

• Run the future-state design during normal and high-demand sessions.
• Test first-case start-up, late-running lists and unexpected scope demand.
• Compare median and upper-percentile turnaround, not only the average.
• Review patient experience, staff workload and safety indicators.
• Remove changes that improve speed but create risk or downstream rework.

Days 76–90: Control and Sustain

• Implement daily visual management and weekly performance review.
• Use run charts for referral lead time, scope turnaround and cancellation rate.
• Assign process owners for referral management, procedure flow and decontamination.
• Create layered audits for standard work, scope tracking and data accuracy.
• Complete a DMAIC tollgate review and document the next kaizen backlog.

7. Build Capability Through Lean Six Sigma Certification

A high-quality VSM is more than a diagram. It is a disciplined method for connecting customer requirements, process data, bottlenecks, variation, root causes and control plans.

Professionals who want to lead this work can develop the required capability through Lean 6 Sigma Hub’s CSSC-accredited Green Belt training. The self-paced online course includes practical tools, real-world simulations, case studies, data analysis, process mapping, hypothesis testing, piloting and control planning.

For leaders responsible for complex, cross-functional healthcare transformation, the CSSC-accredited Black Belt programme provides deeper training in advanced statistics, project leadership, design of experiments and enterprise-level change.

Enrol in CSSC-accredited, self-paced Lean Six Sigma training from Lean 6 Sigma Hub and learn to turn endoscopy delays into measurable, sustainable improvement.

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