ASF Standards · Laboratory · Standard 5
Standard 5 — Facilities, Environment & Suppliers
Criteria in this standard
5.1 — Environmental Conditions Monitored and Logged
5.2 — Physical Separation of Incompatible Activities
5.3 — Access Control to the Testing Area
5.4 — Utility Failure: Documented Contingency
5.5 — Waste Segregated by Hazard Class
5.6 — Critical Supplier Agreements, Documented
5.2 — Physical Separation of Incompatible Activities
5.3 — Access Control to the Testing Area
5.4 — Utility Failure: Documented Contingency
5.5 — Waste Segregated by Hazard Class
5.6 — Critical Supplier Agreements, Documented
5.1
Environmental Conditions Monitored and Logged
Non-Negotiable
Temperature, humidity, and other environmental conditions affecting test validity are continuously monitored in each relevant area, logged, with a documented, time-bound response procedure for excursions outside defined limits.
In plain terms: The lab actually tracks temperature and humidity where it matters, writes it down, and has a real plan for when something goes outside the acceptable range.
| Facility category | Standalone lab | Hospital lab | Clinic lab |
|---|---|---|---|
| Applicability | Full | Full | Full |
Why this matters
A thermometer mounted on the wall is not environmental monitoring unless someone is actually reading and recording it, and a recorded excursion with no documented response is barely better than no monitoring at all. The gap between having a sensor and having a functioning monitoring system is exactly where temperature-sensitive reagents and specimens quietly degrade without anyone noticing until results start looking unusual.
What good looks like
- Monitoring is actually logged, not just displayed on a device nobody checks.
- Every excursion has a documented response action on record.
- Limits are specific to each area’s actual requirements.
Common failure modes
- A thermometer exists but nobody records its readings anywhere.
- Excursions are noted but no follow-up action is documented.
- One generic temperature range is applied regardless of area-specific needs.
Worked example
In practice
A reagent refrigerator in a small clinic laboratory.
BeforeThe refrigerator had a built-in digital display, checked visually by whoever happened to walk past, with no log and no record of what happened the time it briefly read ten degrees above range over a weekend.
ActionThe laboratory installed a continuous logging thermometer with an alarm, assigned daily log review to a named staff member, and wrote a specific excursion response procedure including reagent quarantine and assessment.
AfterThe Monitor reviewed six months of continuous temperature logs and found one documented excursion with a complete, timely response record. Criterion verified.
If you are starting from zero — do this first
- Identify every area with environmental requirements affecting test validity.
- Check whether monitoring in each area is actually logged, not just displayed.
- Write a specific excursion response procedure if none exists.
The most common mistake: Treating a visible thermometer display as equivalent to actual monitoring, when nobody is recording readings or would notice an after-hours excursion.
Self-assessment questions
1. Is environmental monitoring actually logged, not just equipped with a sensor nobody checks? — A thermometer on the wall with no log is not monitoring.
Evidence: Temperature/humidity log
Evidence: Temperature/humidity log
2. Where an excursion occurred, is there a documented record of what action was taken and when? — An excursion logged with no follow-up action recorded is incomplete.
Evidence: Excursion response record
Evidence: Excursion response record
3. Are defined limits specific to each area’s actual requirements, not one generic range applied everywhere? — Reagent storage and specimen processing areas often have different real requirements.
Evidence: Area-specific limit documentation
Evidence: Area-specific limit documentation
Common reasons for a PARTIAL answer
- Monitoring exists but after-hours excursions go uncaught.
- One blanket temperature range is applied to areas with different real needs.
Implementation plan
| When | What |
|---|---|
| Week 1 | Identify all environmentally sensitive areas and their actual requirements. |
| Week 2 | Install or verify continuous logging with alarm capability. |
| Week 3 | Write a specific excursion response procedure. |
| Ongoing | Review logs on a fixed schedule, not only when an alarm triggers. |
How the Monitor verifies this
| Method | What | Detail |
|---|---|---|
| DOCUMENT | Log and response review | Reviews environmental logs for consistency and checks any excursion for a documented response. |
Evidence base
International Organization for Standardization. ISO 15189:2022, Medical laboratories — Requirements for quality and competence, Clause 6.3. Geneva: ISO; 2022.
5.2
Physical Separation of Incompatible Activities
Non-Negotiable
Activities that could cross-contaminate or interfere with each other — specimen reception and clean processing, molecular amplification stages, biohazardous waste handling and clean workspace — are physically separated according to recognized practice for each discipline operated.
In plain terms: Activities that could contaminate each other happen in genuinely separate physical spaces — not just at separate ends of the same open room.
| Facility category | Standalone lab | Hospital lab | Clinic lab |
|---|---|---|---|
| Applicability | Full | Full | Full |
Why this matters
Cross-contamination risk from inadequate physical separation is often invisible until it produces a specific, puzzling result pattern — a molecular test contaminated by amplified product from a prior run, a clean specimen compromised by proximity to waste handling. Recognized separation practice exists precisely because these failure modes have been documented repeatedly across laboratories that assumed informal spatial distance within one open room was sufficient.
What good looks like
- Specimen reception is physically separated from clean processing areas.
- Molecular pre- and post-amplification areas are separated per recognized practice.
- Waste handling is physically separated from clean workspace.
Common failure modes
- Reception and processing share one open room with no real barrier.
- Molecular testing stages share equipment or space without separation.
- Waste handling occurs adjacent to active clean bench work.
Worked example
In practice
A small laboratory performing molecular testing in a single shared room.
BeforePre-amplification specimen preparation and post-amplification analysis occurred at different benches within the same single room, sharing the same air space and general work area, with occasional unexplained contamination-pattern results.
ActionThe laboratory invested in physical separation, converting an adjacent small space into a dedicated post-amplification area with separate equipment and a controlled workflow direction preventing material from moving backward into the pre-amplification space.
AfterThe Monitor inspected the physical layout and confirmed genuine separation per recognized molecular testing practice, and the laboratory’s contamination-pattern result incidents had stopped since the change. Criterion verified.
If you are starting from zero — do this first
- Map every activity in your laboratory that could cross-contaminate another.
- Check current physical separation against recognized practice for each discipline.
- Identify and plan for any genuine gaps found.
The most common mistake: Assuming that working at different benches within the same open room constitutes adequate separation, when shared air space and surfaces can still allow cross-contamination.
Self-assessment questions
1. Is specimen reception physically separated from areas where processed samples are handled? — Shared space for both creates genuine cross-contamination risk.
Evidence: Facility layout inspection
Evidence: Facility layout inspection
2. Where molecular testing is performed, are pre- and post-amplification areas separated per recognized practice? — This is a well-established, specific requirement where applicable, not a general suggestion.
Evidence: Facility layout, workflow documentation
Evidence: Facility layout, workflow documentation
3. Is biohazardous waste handling physically separated from clean workspace and specimen processing? — Shared pathways between waste and clean work areas are a recurring, identifiable risk.
Evidence: Facility layout inspection
Evidence: Facility layout inspection
Common reasons for a PARTIAL answer
- Space constraints have never been formally addressed with recognized separation practice.
- Separation exists for some activities but not molecular-specific stages.
Implementation plan
| When | What |
|---|---|
| Week 1 | Map all activities requiring physical separation. |
| Week 2 | Assess current layout against recognized separation practice. |
| Week 3 | Plan any required physical changes. |
| Ongoing | Reassess separation adequacy whenever services or layout change. |
How the Monitor verifies this
| Method | What | Detail |
|---|---|---|
| OBSERVE | Facility walkthrough | Physically inspects the layout for genuine separation of incompatible activities. |
Evidence base
International Organization for Standardization. ISO 15189:2022, Medical laboratories — Requirements for quality and competence, Clause 6.3.2. Geneva: ISO; 2022.
Clinical and Laboratory Standards Institute. MM19-A2: Establishing Molecular Testing in Clinical Laboratory Environments. Wayne (PA): CLSI; 2011.
5.3
Access Control to the Testing Area
Core
Access to the active testing area is restricted to authorized personnel, with visitor and non-laboratory staff access logged and escorted, protecting both specimen integrity and staff safety.
In plain terms: Only people who are supposed to be in the testing area can actually get in — and anyone else who enters is logged and accompanied.
| Facility category | Standalone lab | Hospital lab | Clinic lab |
|---|---|---|---|
| Applicability | Full | Full | Full |
Why this matters
Uncontrolled access to a testing area creates risk on two fronts simultaneously: specimen integrity, since unauthorized individuals might inadvertently disturb or contaminate samples, and staff safety, since the area typically contains biohazards and chemicals unfamiliar visitors aren’t trained to navigate safely. Restricted, logged, escorted access addresses both at once, which is why it’s treated as a single combined requirement rather than two separate concerns.
What good looks like
- Physical access restriction, not an honor-system open door.
- Visitor access is logged with who, when, and why.
- Visitors are genuinely escorted, not left to move through unaccompanied.
Common failure modes
- The testing area door is unlocked with no real access control.
- Visitors enter without any log entry.
- An escort policy exists but is not actually followed in practice.
Worked example
In practice
A laboratory with a testing area adjacent to a general clinic corridor.
BeforeThe testing area had a door that was simply kept closed but unlocked, relying on an unwritten expectation that non-laboratory staff wouldn’t enter without reason. Maintenance staff occasionally entered unaccompanied with no log entry.
ActionThe laboratory installed a badge-controlled lock restricted to authorized staff, created a visitor log at the entrance, and required any non-laboratory personnel — including maintenance — to be escorted and logged.
AfterThe Monitor reviewed the visitor log and confirmed a recent maintenance visit was logged with an escort name recorded, and verified the door’s access control was functioning. Criterion verified.
If you are starting from zero — do this first
- Check whether your testing area door actually restricts access, or just happens to be closed.
- Create a simple visitor log if none exists.
- Brief staff that all non-laboratory personnel must be escorted and logged, no exceptions.
The most common mistake: Assuming a closed door functions as access control, when anyone can simply open it and enter with no actual restriction or record.
Self-assessment questions
1. Is the testing area physically restricted, not an open space any staff member can enter? — A locked door or controlled entry point, not an honor-system expectation.
Evidence: Access control mechanism
Evidence: Access control mechanism
2. Is non-laboratory visitor access logged, with a record of who entered and when? — Unlogged access makes any later investigation of a contamination or security concern impossible.
Evidence: Visitor log
Evidence: Visitor log
3. Are visitors actually escorted, or left to move through the space unaccompanied? — A stated escort policy that isn’t followed in practice fails this.
Evidence: Observed practice, log entries
Evidence: Observed practice, log entries
Common reasons for a PARTIAL answer
- A closed but unlocked door is treated as sufficient access control.
- Maintenance or other recurring visitors are exempted from logging in practice.
Implementation plan
| When | What |
|---|---|
| Week 1 | Assess current access control adequacy. |
| Week 2 | Install or formalize a real access restriction mechanism. |
| Week 3 | Create a visitor log and escort requirement, brief all staff. |
| Ongoing | Review the visitor log periodically for compliance. |
How the Monitor verifies this
| Method | What | Detail |
|---|---|---|
| OBSERVE | Access control test | Checks the physical access restriction and reviews the visitor log for recent entries. |
Evidence base
International Organization for Standardization. ISO 15189:2022, Medical laboratories — Requirements for quality and competence, Clause 6.3.3. Geneva: ISO; 2022.
5.4
Utility Failure: Documented Contingency
Core
A written contingency plan covers loss of power, water, or network connectivity, including protection of in-process specimens and stored reagents, and is tested at a defined interval rather than existing only as an untested document.
In plain terms: There’s a real, tested plan for what happens if the power or network goes out — not just a document nobody’s ever actually tried.
| Facility category | Standalone lab | Hospital lab | Clinic lab |
|---|---|---|---|
| Applicability | Full | Full | Full |
Why this matters
A contingency plan that has never been tested frequently fails in ways nobody anticipated when it was written — a backup generator that doesn’t actually start, a battery backup with far less runtime than assumed, staff who don’t know their specific role during an actual event. Testing is what converts a plan from a theoretical document into something the laboratory can genuinely rely on at 2am during a real outage.
What good looks like
- The plan specifically addresses in-process specimens and stored reagents.
- Testing has actually occurred within a defined interval, with findings recorded.
- Staff on shift know their specific role in the plan.
Common failure modes
- A generic continuity plan exists but doesn’t address specimens or reagents specifically.
- The plan has never actually been tested since it was written.
- Only management knows the plan exists; frontline staff don’t.
Worked example
In practice
A laboratory conducting its first power-failure contingency test.
BeforeA written contingency plan existed, referencing a backup generator, but had never been tested. During the test, the generator failed to start automatically and required manual intervention that took eleven minutes — well beyond what the plan assumed for protecting reagent cold storage.
ActionThe laboratory had the generator serviced and the automatic start mechanism repaired, revised the plan to reflect realistic response timing, and scheduled annual testing going forward with findings documented each time.
AfterThe Monitor reviewed the test record from the most recent annual test, which showed successful automatic generator start within the expected window. Criterion verified.
If you are starting from zero — do this first
- Check whether a written utility-failure plan exists at all.
- If it exists but has never been tested, schedule a real test now.
- Brief staff on shift about their specific role during an actual event.
The most common mistake: Writing a plausible-sounding contingency plan and treating it as complete without ever actually testing whether it works in practice.
Self-assessment questions
1. Does the plan specifically address protection of specimens and reagents already in process at the moment of failure? — Generic continuity language without this detail misses the point most relevant to patient safety.
Evidence: Written contingency plan
Evidence: Written contingency plan
2. Has the plan been tested within a defined interval, with a record of what the test found? — An untested plan frequently fails in ways nobody anticipated.
Evidence: Test record
Evidence: Test record
3. Do staff on shift know where to find the plan and what their specific role in it is? — A plan known only to management does not function during an actual event at 2am.
Evidence: Staff interview
Evidence: Staff interview
Common reasons for a PARTIAL answer
- The plan exists but has never been physically tested.
- Staff are unaware of their specific role during an actual event.
Implementation plan
| When | What |
|---|---|
| Week 1 | Review or write the written contingency plan. |
| Week 2 | Schedule and conduct a real test. |
| Week 3 | Revise the plan based on what the test revealed and brief staff. |
| Ongoing | Test on a fixed annual or more frequent schedule. |
How the Monitor verifies this
| Method | What | Detail |
|---|---|---|
| DOCUMENT | Plan and test record review | Reviews the written plan’s specificity and checks for a genuine, dated test record. |
| ASK | Staff role interview | Asks on-shift staff to describe their role during a utility failure. |
Evidence base
International Organization for Standardization. ISO 15189:2022, Medical laboratories — Requirements for quality and competence, Clause 6.3.4. Geneva: ISO; 2022.
5.5
Waste Segregated by Hazard Class
Non-Negotiable
Biohazardous, chemical, and sharps waste are segregated at the point of generation into clearly marked, appropriate containers, with documented disposal through a licensed contractor or equivalent regulated pathway.
In plain terms: Different kinds of hazardous waste go into the right container right where they’re generated, and disposal happens through a real, licensed route — not an informal arrangement.
| Facility category | Standalone lab | Hospital lab | Clinic lab |
|---|---|---|---|
| Applicability | Full | Full | Full |
Why this matters
Segregation only works when the correct container is physically present and within easy reach at the exact point waste is generated — a centralized disposal station two rooms away encourages mixing waste types out of simple convenience under time pressure. Overfilled sharps containers and informal, unlicensed disposal arrangements are two of the most common, specific, and directly dangerous gaps found during facility reviews.
What good looks like
- Correct waste containers are present at each bench, not centralized.
- Disposal is documented through a licensed, regulated contractor.
- Sharps containers are replaced before reaching unsafe fill levels.
Common failure modes
- A single waste station is shared across a distant work area, encouraging mixing.
- Disposal relies on an informal, undocumented arrangement.
- Sharps containers are overfilled before replacement.
Worked example
In practice
A hematology section with a single waste station at the room’s entrance.
BeforeThe only waste containers were located by the door, a short walk from the benches where specimens were actually processed. Under time pressure, staff occasionally discarded mixed waste types into whichever container was closest to their workflow at that moment.
ActionThe laboratory installed correctly labeled sharps, biohazard, and general waste containers directly at each bench, and formalized a written disposal contract with a licensed waste management company, retaining manifests as proof of proper disposal.
AfterThe Monitor inspected each bench and found correct containers within immediate reach, none overfilled, and reviewed a current disposal manifest from the licensed contractor. Criterion verified.
If you are starting from zero — do this first
- Check whether correct waste containers are actually present at each bench.
- Confirm your disposal arrangement is licensed and documented, not informal.
- Check current sharps container fill levels right now.
The most common mistake: Centralizing waste disposal at one convenient location rather than the point of generation, which predictably leads to mixed-waste shortcuts under time pressure.
Self-assessment questions
1. Are the correct waste containers actually present and in use at each bench, not centralized in a way that encourages mixing? — Segregation only works if the right container is within reach at the point of generation.
Evidence: Bench inspection
Evidence: Bench inspection
2. Is there documentation of licensed, regulated disposal, not an informal arrangement? — A disposal manifest or equivalent record, verifiable on request.
Evidence: Disposal manifest, contractor license
Evidence: Disposal manifest, contractor license
3. Are sharps containers replaced before reaching unsafe fill levels, verified by spot check? — An overfilled sharps container is an immediate, specific injury risk.
Evidence: Sharps container inspection
Evidence: Sharps container inspection
Common reasons for a PARTIAL answer
- Containers are centralized rather than at point of generation.
- Disposal happens but documentation is incomplete or missing.
Implementation plan
| When | What |
|---|---|
| Week 1 | Inspect current waste container placement against point-of-generation practice. |
| Week 2 | Relocate or add containers as needed. |
| Week 3 | Confirm or establish a licensed disposal contract with retained manifests. |
| Ongoing | Spot-check sharps container fill levels regularly. |
How the Monitor verifies this
| Method | What | Detail |
|---|---|---|
| OBSERVE | Bench inspection | Checks for correct, appropriately filled waste containers at each bench. |
| DOCUMENT | Disposal manifest review | Reviews current licensed disposal contractor documentation. |
Evidence base
World Health Organization. Safe management of wastes from health-care activities, 2nd ed. Geneva: WHO; 2014.
International Organization for Standardization. ISO 15189:2022, Medical laboratories — Requirements for quality and competence, Clause 6.3.5. Geneva: ISO; 2022.
5.6
Critical Supplier Agreements, Documented
Standard
Agreements with critical suppliers — reagent manufacturers, waste contractors, reference laboratories — are documented in writing, specifying the service or product, quality expectations, and renewal terms.
In plain terms: Important supplier relationships are backed by a real written agreement, not just a standing informal arrangement.
| Facility category | Standalone lab | Hospital lab | Clinic lab |
|---|---|---|---|
| Applicability | Full | Full | Full |
Why this matters
Written agreements do more than formalize a commercial relationship — they create a documented baseline of quality expectations that both parties can be held to, and they prevent long-standing relationships from quietly drifting without anyone noticing a decline in service, because nothing was ever specified in writing to measure against.
What good looks like
- A written agreement exists for every critical supplier.
- Agreements specify quality expectations, not just commercial terms.
- A process exists for renewing or re-evaluating agreements before they lapse.
Common failure modes
- A long-standing relationship was never formalized in writing.
- Agreements cover price and delivery but say nothing about quality.
- An agreement has lapsed but the relationship continues unchanged.
Worked example
In practice
A laboratory’s long-standing relationship with its primary reagent supplier.
BeforeThe laboratory had purchased from the same reagent supplier for over a decade, based entirely on an informal, never-renewed verbal arrangement with no written quality expectations specified anywhere.
ActionThe quality manager formalized a written agreement specifying delivery reliability, quality certification requirements, and an annual renewal review date.
AfterThe Monitor reviewed the written agreement and confirmed it specified quality expectations and had a current, unexpired renewal date. Criterion verified.
If you are starting from zero — do this first
- List every critical supplier currently operating without a written agreement.
- Draft agreements specifying both commercial and quality terms.
- Set renewal review dates for each.
The most common mistake: Assuming a long and reliable relationship doesn’t need formal documentation, when the absence of written quality expectations leaves nothing to point to if performance later declines.
Self-assessment questions
1. Does a written agreement exist for each critical supplier, not an informal, undocumented working relationship? — Especially relevant for long-standing suppliers where formal paperwork is sometimes allowed to lapse.
Evidence: Written supplier agreement
Evidence: Written supplier agreement
2. Do agreements specify quality expectations relevant to patient safety, not only commercial terms? — A contract covering price and delivery but silent on quality standards is incomplete for this purpose.
Evidence: Agreement quality clause
Evidence: Agreement quality clause
3. Is there a process for renewing or re-evaluating agreements before they lapse? — An expired agreement still being operated under is a gap worth noting even if the relationship itself continues smoothly.
Evidence: Renewal schedule
Evidence: Renewal schedule
Common reasons for a PARTIAL answer
- Long-standing suppliers were never formally documented.
- Agreements exist but have quietly lapsed without renewal.
Implementation plan
| When | What |
|---|---|
| Week 1 | List critical suppliers lacking a written agreement. |
| Week 2 | Draft agreements specifying quality and commercial terms. |
| Week 3 | Finalize and set renewal review dates. |
| Ongoing | Review agreements before each renewal date, not after it lapses. |
How the Monitor verifies this
| Method | What | Detail |
|---|---|---|
| DOCUMENT | Agreement review | Checks for written, current agreements with critical suppliers, including quality terms. |
Evidence base
International Organization for Standardization. ISO 15189:2022, Medical laboratories — Requirements for quality and competence, Clause 6.6. Geneva: ISO; 2022.