Top 10 CAP Deficiencies in Medical Laboratories and How to Avoid Them: A Comprehensive Guide
August 7, 2026
Written by
Ashley Cerna
Marketing Coordinator
CAP inspection deficiencies rarely come as surprises. Year after year, laboratories are cited for many of the same operational issues, from documentation and proficiency testing evaluation to equipment records and activity menu accuracy. The consistency of these findings offers an opportunity. When a laboratory knows which requirements CAP cites most often, it can strengthen those systems long before an inspector arrives.
These are the ten citations a laboratory is statistically most likely to see at its next inspection. Knowing where they sit is one of the most efficient ways to prepare. Below is the current top ten, why each one gets cited, how to avoid it, and what changed in the most recent CAP checklist edition that laboratories should be watching.
The Top 10 CAP Deficiencies at a Glance
Source: College of American Pathologists, 2025 All Common Checklist deficiency data.
The Top 10 CAP Deficiencies, Explained
1. COM.10000 Policy and Procedure Manual
What it is and why it is cited. This is the most cited deficiency on CAP's current list. It is almost never cited because a laboratory lacks procedures. It is cited because the complete, current manual is not physically or electronically present at the workbench or in the work area where testing happens. A binder in the manager's office does not satisfy the requirement if the bench technologist cannot reach it during testing.
How to avoid it. Confirm that every testing area has direct access to the full, current manual, whether in print or through a system staff can pull up at the bench. When a procedure is revised, the outdated version needs to disappear from every access point at the same time the new one goes live. A single source of truth, enforced through version control rather than staff memory, is what closes this gap for good.
2. COM.04075 Activity Menu
What it is and why it is cited. The Activity Menu is the laboratory's declaration of every test it performs, and CAP checks it against reality. Laboratories add tests, retire tests, or change methodologies, and the menu quietly falls out of sync. CAP points to a specific trigger: an instrument change that moves a test from waived to nonwaived, with no corresponding menu update. Inspectors also cite mismatches between the activity menu in the inspector packet and the laboratory's current menu, and activities listed under the wrong section unit.
How to avoid it. Build the menu update into the test implementation and retirement process itself. It should be a step in the workflow, not a periodic audit. Check that methods and services are current too, since the menu drives how CAP customizes the checklist. An inaccurate menu means an inaccurate checklist, which creates problems well beyond this one citation.
3. COM.01700 PT and Alternative Performance Assessment Result Evaluation
What it is and why it is cited. Proficiency testing does not end when results come back. The laboratory director or designee must evaluate every PT and Alternative Performance Assessment Result on an ongoing basis and take corrective action on anything unacceptable. Inspectors frequently find PT results that were received and filed, with no documented evaluation behind them.
How to avoid it. Treat every PT event as required by a documented review, including a determination of impact on patient results, not only a signature. CAP has clarified that the timeframe for investigating an unacceptable result should be appropriate to the situation rather than fixed, which places greater emphasis on the laboratory's ability to demonstrate that it evaluated the result and documented its reasoning.
4. COM.30600 Maintenance and Function Checks
What it is and why it is cited. Instruments and equipment require scheduled maintenance and function checks. CAP wants to see that the schedule was followed, not just that it exists. Gaps in the record are treated the same as gaps in the maintenance itself.
How to avoid it. Maintain a schedule for every piece of equipment and log each check at the time it happens. A record built after the fact, even an accurate one, reads differently to an inspector than one that accumulated in real time.
5. GEN.55500 Competency Assessment Elements, Nonwaived Testing
What it is and why it is cited. Competency for personnel performing nonwaived testing must be assessed using all six elements, as applicable, on each test system, for each individual, during each assessment period. This requirement topped the list two years ago and still sits in the top five. CAP attributes the citations to three things: not documenting all six applicable elements or leaving the assessed element unclear, supporting records that are missing or unavailable, and confusion about what counts as a test system, such as lumping every manual test into one.
How to avoid it. Define the test systems first. That single decision drives how many assessments the laboratory owes, and getting it wrong makes every downstream record incomplete. Tests on the same platform can often be grouped, but a test with unique pretreatment or handling needs its own assessment. Then make each of the six elements individually visible in the record. Assessment can ride along with work the laboratory already does, and CAP explicitly allows it: element three can come from the monthly review of quality control and maintenance records, element five from PT record review, element six from corrective action logs. What CAP will not accept is a checklist that says competency was assessed without showing which element was assessed and how.
6. COM.04250 Comparability of Instruments and Methods, Nonwaived Testing
What it is and why it is cited. When a laboratory uses more than one nonwaived instrument or method for the same analyte, those instruments and methods must be checked against each other at least twice a calendar year. CAP cites three reasons most often: the studies were not performed twice a year, no acceptance criteria were defined, and the laboratory did not realize the requirement applies beyond identical instruments.
How to avoid it. That third reason is the expensive one. The requirement covers different makes, different models, and different methods, even when reference intervals or sensitivities differ. It includes backup methods used for patient testing. Schedule the studies the way PT enrollment is scheduled, define acceptance criteria in writing before running them, and document the comparison, the criteria, and any corrective action taken when instruments diverged.
7. COM.04200 Instrument and Equipment Record Review
What it is and why it is cited. Recording maintenance and function checks is not enough on its own. The laboratory director or designee must review and assess those records at least monthly, with a signature or initials and the review date. CAP lists three failure patterns: review skipped during staffing shortages, review never performed for less frequently used equipment such as an osmometer, and several months of review completed on a single date.
How to avoid it. That last one deserves attention, because it usually reflects good intentions. Catching up on four months of review in one sitting produces a complete-looking record that CAP treats as untimely. Assign monthly review as a standing responsibility with a named backup, and include the equipment that runs twice a quarter alongside the analyzers that run every day.
8. GEN.20450 Correction of Laboratory Records
What it is and why it is cited. Corrections to laboratory records, including quality control data, temperature logs, and worksheets, must be made with techniques that keep the original entry visible or accessible, and that identify who changed the record and when. The written procedure usually exists. CAP's cited reason is that staff do not follow it. The specific examples are scratching out an erroneous entry instead of drawing a single line through it, and failing to date or initial the change.
How to avoid it. This is the most fixable item on the list, because it costs nothing but consistency. Show the correct technique during onboarding and reinforce it during competency checks. One line through the error, the correction beside it, initials and date. Erasers and correction fluid have no place near a laboratory record. For electronic records, confirm the audit trail actually captures the identity of the person making the change, not just the timestamp.
9. COM.30300 Reagent Labeling, Nonwaived Tests
What it is and why it is cited. Reagents, calibrators, controls, stains, chemicals, and solutions must be labeled, as applicable, with four things: content and quantity or concentration, storage requirements, the date the laboratory prepared or reconstituted it, and the expiration date. CAP cites missing expiration dates, secondary containers missing required information, and stain lines that are unlabeled with log sheets that cannot be traced back to them.
How to avoid it. Two points are worth knowing precisely, because laboratories routinely over-label. Date received is not routinely required, and there is no routine requirement to label individual containers with date opened. What is required is a new expiration date whenever opening a container changes it. The elements may also live in a paper or electronic log instead of on the container, provided every container is traceable to the right entry in that log. Post a short labeling standard in each work area and audit secondary containers specifically, since those are where the gaps show up.
10. COM.30750 Temperature Checks
What it is and why it is cited. Temperature-dependent storage devices and environments must be checked daily using a calibrated thermometer, and temperature-dependent equipment must be checked on each day of use. CAP's cited reasons are missing days in manually recorded logs, no corrective action documented for an out-of-range reading, and laboratories that are not open around the clock failing to use a minimum/maximum thermometer during closures.
How to avoid it. The closure gap catches laboratories that believe they are compliant. If the laboratory is closed on Sunday, a continuous monitoring device or a minimum/maximum thermometer covers the requirement, but only if the data is evaluated on the next business day before anything stored there is used. Automated monitoring reduces missed checks. It does not replace the need for a defined action plan when a reading falls out of range, or for documentation that the plan was followed.
What Changed in the Latest CAP Checklist Edition
The membership of the top ten barely moved. The ranking moved a lot, and that is the more useful signal.
Only one requirement changed membership. PT attestation statements (COM.01400) dropped off the list, and reagent labeling (COM.30300) came on. Everything else that appeared in our 2024 edition of this article is still here.
The order tells a different story:
Two things stand out. Competency assessment and instrument comparability, which held the top two spots, both fell four places. Neither requirement got easier. What likely changed is that laboratories responded to years of being told these were the most cited findings, and the industry improved. That is what a top ten list is for.
Meanwhile, the policy and procedure manual moved from fourth to first. It is now the single most cited requirement on CAP's All Common checklist, and the reasons CAP gives are almost entirely about version control rather than about writing procedures.
One administrative note worth flagging. CAP's current documentation identifies the Activity Menu requirement as COM.04075 and instructs inspectors to cite COM.04075, though some CAP resource listings still reference the older COM.01200. Laboratories should confirm the current code against their customized checklist.
The broader takeaway is that a laboratory's own history of deficiencies is not a reliable predictor of its next inspection. Checklist requirements are revised annually. A requirement that was easy to satisfy under one interpretation can become harder under a revised one. Laboratories that review checklist revisions as they are published, rather than when an inspection is announced, catch these shifts before an inspector does.
How Do You Build a Laboratory That Avoids These Deficiencies Year-Round?
Looking at this list, a pattern emerges. None of these ten deficiencies are exotic. They are the requirements every laboratory already knows it must meet. What separates laboratories that get cited from laboratories that do not is rarely knowledge of the requirement. It is whether the evidence of compliance exists is current and is easy for an inspector to find.
Read CAP's own stated reasons for each citation and the same theme repeats. Staff performed the maintenance but did not record it. The procedure changed but the document did not. The review happened, four months late, all at once. These are not training gaps. They are gaps in the system that was supposed to capture the work.
That distinction shows up directly in this list. A policy manual that is complete but sitting in the wrong place is a documentation and access problem, not a knowledge problem. A maintenance log with gaps reflects a workflow problem, not a training problem. An expired reagent on the shelf is an inventory system problem. Each of these ten deficiencies traces back to a system, not a person. Systems are what a purpose-built laboratory quality management platform is designed to support.
MediaLab by Vastian centralizes exactly the kind of evidence this list demands. InspectionProof allows laboratories to import checklists directly from CAP, COLA, AABB, TJC, and other accrediting bodies, then assign checklist items to the staff responsible for linking the SOPs, competency assessments, maintenance logs, and temperature records that demonstrate compliance. A real-time dashboard shows exactly which sections still need evidence loaded, well ahead of inspection day. Inspectors can be granted view-only access to review that evidence at their own pace. The goal is not to prepare faster once an inspection is announced. It is to make preparation unnecessary, because the evidence already exists.
Frequently Asked Questions
What are the most common CAP deficiencies?
They cluster around documentation, proficiency testing evaluation, instrument and equipment records, and activity menu accuracy. CAP's current top ten, in order, are the policy and procedure manual (COM.10000), the activity menu (COM.04075), PT and alternative performance assessment result evaluation (COM.01700), maintenance and function checks (COM.30600), competency assessment elements (GEN.55500), comparability of instruments and methods (COM.04250), instrument and equipment record review (COM.04200), correction of laboratory records (GEN.20450), reagent labeling (COM.30300), and temperature checks (COM.30750).
What is the most cited CAP deficiency?
COM.10000, the requirement that a complete policy and procedure manual be available at the workbench or in the work area, is currently the most cited deficiency on CAP's All Common checklist. It has appeared in the top five across multiple recent years and now holds the top spot.
Why did competency assessment fall off the top of the list?
It did not fall off. GEN.55500 competency assessment moved from first to fifth. It remains one of the ten most cited requirements. The most common reasons CAP gives for the citation are unchanged: not documenting all six applicable elements, missing supporting records, and confusion about what constitutes a test system.
How often does CAP update its checklists?
CAP updates its accreditation checklists annually across its 21 discipline-specific checklists, including the All Common and Laboratory General checklists that drive most of the deficiencies on this list. Revisions clarify language that caused inconsistent interpretation, or address areas where citations have concentrated.
What happens if a laboratory receives a CAP deficiency?
The laboratory must submit a response to each cited deficiency, including the corrective actions taken, within the timeframe CAP specifies after the inspection. CAP then reviews the response to verify the deficiency has been adequately addressed before closing the citation.
How can a laboratory prepare for a CAP inspection?
The most effective preparation is continuous rather than seasonal. Keeping documentation current, competency assessments on schedule, and equipment and temperature records complete as a matter of daily operation means there is no separate preparation cycle to manage when an inspection is announced.
The Bottom Line
The top ten CAP deficiencies are predictable, well documented, and largely preventable. The requirements behind them have not become harder to meet. What changes, year to year, is which ones CAP cites most often, and the current list shows real movement. Two requirements that held the top spots have fallen four places each, while the policy and procedure manual has risen to first. Laboratories that build continuous readiness into daily operations, instead of concentrating compliance work ahead of an inspection, avoid recurring citations and stay inspection-ready year-round.