CLIA Cheat Sheet 2026

The 30 highest-yield CLIA facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. Which federal agency is primarily responsible for implementing and enforcing CLIA regulations? → Centers for Medicare & Medicaid Services (CMS)
2. A laboratory receives a corrected patient report after discovering a transcription error in the original result. Under CLIA, the corrected report must: → Clearly identify it as a corrected report and include the original result for comparison
3. Which factor MOST significantly affects the quality of technical outcomes in CLIA practice? → The practitioner's training, preparation, and attention to detail
4. Under CLIA, when must a laboratory re-validate a test method? → When there is a significant change in reagents, equipment, or methodology
5. What does calibration of laboratory equipment ensure? → Accurate and reliable equipment performance
6. What must a laboratory do when it receives its PT results from the provider? → Review results, investigate any failures, and document corrective actions
7. A laboratory discovers that it failed a proficiency testing event. Under CLIA, what is the required initial response? → Perform an investigation and take corrective action, documenting the findings
8. What is the consequence of intentional referral of proficiency testing samples to another laboratory under CLIA? → Suspension or revocation of the CLIA certificate and civil monetary penalties
9. Who is responsible for ensuring regulatory compliance in a lab? → Management and staff
10. Which CLIA provision requires laboratories to retain patient testing records, including all QC data and instrument maintenance logs, for a minimum of 2 years? → The record retention requirement under CLIA 42 CFR 493.1105
11. Which documentation practice BEST demonstrates regulatory compliance for CLIA certified professionals? → Maintaining organized, dated, and signed records of all activities
12. Which personal protective equipment (PPE) principle applies to ALL CLIA certified professionals regardless of their specific role? → PPE must be properly fitted, maintained, and replaced as needed
13. A clinical laboratory receives a chemical shipment without a Safety Data Sheet (SDS). What is the MOST appropriate immediate action? → Return the shipment and request an SDS before use
14. Why is documentation important in laboratory quality systems? → To provide traceability and support audits
15. What role does calibration play in maintaining technical accuracy for Clinical Laboratory Improvement Amendments Certification professionals? → It ensures instruments produce accurate, consistent results over time
16. Under CLIA, a laboratory must notify CMS within how many days if the laboratory director position becomes vacant? → 30 days
17. Under CLIA, which of the following activities does the Certificate of Waiver NOT exempt a laboratory from complying with? → Manufacturer's instructions for performing the test
18. In CLIA practice, what happens when regulations are updated? → Professionals must update knowledge and practices to meet new requirements
19. Under CLIA, who may serve as general supervisor for a high-complexity testing laboratory? → A person with an associate degree and 2 years of high-complexity testing experience
20. In method validation, 'analytical specificity' refers to a method's ability to: → Measure only the intended analyte without interference from other substances
21. Under CLIA, the general supervisor for high-complexity testing must be on-site or available during which hours? → All hours testing is performed
22. What does the term 'limit of quantitation' (LoQ) describe in laboratory testing? → The lowest concentration that can be measured with acceptable precision and accuracy
23. CMS uses a scoring system based on how many criteria to categorize laboratory tests as waived, moderate-, or high-complexity? → Seven
24. The Westgard 1₃s rule is violated when: → One control value exceeds ±3 SD
25. Under CLIA, when must a laboratory notify CMS of a change in laboratory director? → Within 30 days of the change
26. Under CLIA, which type of microscopy procedures qualify for a Certificate for Provider-Performed Microscopy (PPM)? → Wet mounts, KOH preparations, and fern tests performed during the patient visit
27. In Clinical Laboratory Improvement Amendments Certification, what is the PRIMARY purpose of conducting regular safety drills and exercises? → To ensure personnel can respond effectively in emergencies
28. Laboratories holding only a Certificate of Waiver are subject to which type of CMS inspection? → Complaint inspections only
29. When assessment results for a Clinical Laboratory Improvement Amendments Certification evaluation are inconclusive, the BEST practice is to: → Conduct additional assessment using alternative methods
30. Which statistical test is most appropriate for comparing bias between a new method and a comparative (reference) method in a method comparison study? → Paired t-test or Deming regression