Preparing for a College of American Pathologists (CAP) inspection requires more than organizing documents shortly before the inspection date. Laboratories must demonstrate that their policies, procedures, quality systems, and testing practices are consistently implemented throughout the accreditation cycle.
Although findings vary by laboratory discipline, testing scope, and checklist edition, several compliance risks appear repeatedly during inspection preparation. Understanding these areas can help laboratory leaders identify vulnerabilities before they become deficiencies.
The following are five commonly encountered CAP inspection risk areas. This article is educational and does not represent an official CAP ranking.
1. Incomplete Competency Assessments
Personnel competency is one of the most challenging compliance areas for many laboratories. CAP has identified competency assessment as an area that frequently appears among accreditation deficiencies.
A completed checklist or training record does not automatically demonstrate competency. The laboratory must be able to show that each applicable employee was assessed for the test systems they use, at the required frequency, through the appropriate assessment methods.
Common gaps include:
- Missing required competency elements
- Assessments that do not cover every applicable test system
- Overdue initial, semiannual, or annual assessments
- Insufficient supporting documentation
- Assessments performed by individuals who do not meet applicable qualifications
- Confusing training with competency assessment
- Using one general form for multiple test systems without adequate evidence
To reduce risk, laboratories should maintain a complete test-system inventory and connect each system to the employees who perform that testing. A centralized tracking tool should identify upcoming due dates, completed assessment elements, assessors, and supporting records.
Competency documentation must also be readily retrievable. CAP notes that competency-related records are among the documentation inspectors may request and that inaccessible records can result in a deficiency. Laboratories should therefore test their ability to retrieve these records during self-inspections and mock inspections.
2. Proficiency Testing Compliance and Tracking Gaps
Proficiency testing (PT) is essential for evaluating the accuracy and reliability of laboratory testing. Compliance involves more than submitting results before the deadline. Laboratories must manage the entire PT process—from enrollment and specimen handling through result review, investigation, and corrective action.
Potential deficiencies include:
- Failure to enroll in appropriate PT programs
- Missed submission deadlines
- Incomplete or inaccurate result submission
- Improper testing or handling of PT specimens
- Communication with another laboratory when prohibited
- Referral of PT specimens
- Missing attestation or required signatures
- Failure to review final evaluation reports
- Inadequate investigation of unacceptable performance
- Missing evidence that corrective actions were effective
- Failure to perform alternative assessment when PT is unavailable
Every laboratory should maintain a PT master schedule that includes shipment dates, testing assignments, submission deadlines, review responsibilities, final report dates, and corrective-action status. Responsibilities should be clearly assigned, with backup coverage established for absences.
When unacceptable performance occurs, the investigation should extend beyond statements such as “retrained employee” or “random error.” A complete response should evaluate potential preanalytical, analytical, postanalytical, clerical, methodological, and personnel-related causes. It should also document immediate containment, root-cause analysis, corrective action, evaluation of patient-result impact when applicable, and evidence of effectiveness.
CAP provides PT performance reports and educational resources to help laboratories monitor their programs and strengthen continuous improvement.
3. Outdated or Incomplete Policies and Procedures
Laboratory procedures must accurately reflect current practices. A procedure can become a compliance risk when it no longer matches the instrument, reagent, workflow, manufacturer’s instructions, regulatory requirements, or laboratory process in use.
Common document-control deficiencies include:
- Missing laboratory director approval
- Overdue procedure reviews
- Obsolete documents remaining available at the bench
- Unauthorized or undocumented revisions
- Procedures that do not reflect current practices
- Missing effective dates or version numbers
- Incomplete records of staff notification or training
- Manufacturer package inserts being used without laboratory-specific instructions
- Inconsistent electronic and printed versions
A reliable document-control system should identify each document’s owner, approval status, effective date, review date, current version, revision history, and distribution location. When a procedure changes, the laboratory should assess whether staff education, competency reassessment, validation, or additional communication is required.
Laboratories should also verify document control by tracing selected procedures from approval through implementation. CAP updates its discipline-specific accreditation checklists annually, making it important for laboratories to compare their policies and procedures with the checklist edition assigned to their inspection.
4. Inadequate Quality Control Investigation and Corrective Action
Quality control documentation should demonstrate that the laboratory recognizes unacceptable performance, investigates the problem, protects patients, corrects the cause, and verifies that the testing system is functioning properly before reporting patient results.
Common deficiencies may involve:
- QC results outside acceptable limits without documented investigation
- Repeating QC until it falls within range without identifying the cause
- Incomplete documentation of corrective actions
- Patient testing continuing during unresolved QC failure
- Failure to assess potentially affected patient results
- Missing supervisor or director review
- Corrective actions that do not address the root cause
- No evidence that the corrective action was effective
- Recurring problems without escalation or preventive action
Documentation should tell the complete story: what occurred, when it was discovered, what testing was affected, what immediate action was taken, what caused the problem, how it was corrected, and how acceptable performance was confirmed.
When patient results may have been affected, the laboratory should document its impact assessment and any necessary result correction, clinician notification, or patient follow-up. Repeated QC failures should be evaluated as trends rather than managed as isolated events.
5. Incomplete Method Validation or Verification
Before reporting patient results from a new or modified test system, the laboratory must establish or verify that the method performs acceptably in its environment. The exact requirements depend on factors such as test complexity, method type, intended use, and whether the method is FDA-cleared, FDA-approved, modified, or laboratory-developed.
Frequently encountered gaps include:
- Patient testing beginning before studies are completed and approved
- Missing acceptance criteria
- Inadequate sample size or concentration coverage
- Incomplete accuracy or precision studies
- Insufficient analytical measurement range verification
- Unsupported reportable ranges
- Missing reference interval verification or establishment
- Failure to assess method comparison or bias
- Incomplete carryover, interference, or detection-limit studies when applicable
- Missing laboratory director review and approval
- Failure to validate modifications to an existing method
- Incomplete documentation of calculations, raw data, and conclusions
A validation or verification plan should be approved before the study begins. It should define the performance characteristics being evaluated, materials and specimens to be used, statistical methods, acceptance criteria, responsibilities, and approval requirements.
The final report should include raw data, analysis, deviations, conclusions, limitations, and documented authorization to begin patient testing. Laboratories should also confirm that procedures, reference intervals, quality control, competency assessments, and the laboratory information system are ready before implementation.
Building Continuous Inspection Readiness
The strongest inspection-readiness programs do not begin 30 days before an inspection. They incorporate compliance into routine laboratory operations.
Laboratories can reduce deficiency risk by:
- Conducting a thorough self-inspection using the current customized CAP checklists
- Reviewing previous deficiencies and confirming sustained corrective action
- Performing tracer audits across the total testing process
- Maintaining centralized competency and PT tracking systems
- Auditing validation, QC, maintenance, and procedure records regularly
- Interviewing staff to evaluate their understanding of policies and responsibilities
- Correcting systemic causes rather than repairing isolated documents
- Confirming that evidence of compliance is current, complete, and retrievable
CAP offers inspection-preparation worksheets, training, guidelines, and other resources to support laboratories throughout the accreditation cycle. Explore CAP inspection tools and training.
How Accreditation Lab Partners Can Help
Accreditation Lab Partners (ALP) helps clinical laboratories identify compliance risks, prepare for CAP inspections, and build sustainable quality systems.
Our services include:
- CAP and CLIA readiness assessments
- Mock inspections and regulatory gap analyses
- Competency-program development and tracking
- Proficiency testing compliance and oversight
- Procedure and document-control reviews
- Method validation and verification support
- Quality-control and corrective-action review
- Deficiency-response assistance
- Continuous-readiness planning
A successful inspection should reflect the quality systems practiced every day—not a last-minute effort to assemble documentation.
Building Quality. Achieving Compliance.