Quality Assurance and Safety
What this domain tests
Quality Assurance and Safety covers quality control rules, calibration and method validation, proficiency testing, quality indicators, and the OSHA and chemical safety requirements that apply to a clinical laboratory.
Quality control and validation
- Run at least two levels of QC per day of testing for moderate- and high-complexity methods, unless the manufacturer's instructions or an approved alternative QC plan specify otherwise.
- Levey–Jennings charts display results against mean and standard deviation. Westgard multirules: 1-3s rejects (random or systematic); 2-2s rejects (systematic); R-4s rejects (random); 4-1s and 10x reject (systematic drift).
- Calibration establishes the relationship between signal and concentration; calibration verification confirms it across the analytical measurement range. Method validation covers precision, trueness, AMR, limit of detection, interference, and reference interval.
- Proficiency testing must be handled like patient samples; never refer PT challenges to another laboratory or share results.
Safety
- OSHA bloodborne pathogens standard: written exposure control plan, PPE, engineering controls, hepatitis B vaccination offer, and post-exposure evaluation.
- Chemical hygiene plan with SDS access, labeled secondary containers, fume hoods, spill kits, and compatible waste segregation.
- Fire response (RACE, PASS), electrical safety, radiation badges where applicable, and ergonomic assessment for pipetting and microscopy.
Worked example
Level 1 QC gives 1-2s and level 2 gives 1-3s on the same run. Reasoning: 1-3s is a rejection rule by itself; a single result beyond three standard deviations means the run is out of control, regardless of the other level. 1-2s alone is only a warning. Reject, do not report patient results, and investigate calibration drift, a new reagent lot, or a deteriorating control.
Traps that cost marks
- Rejecting a run on 1-2s alone.
- Calling a 2-2s event random error.
- Forwarding a proficiency testing challenge to a reference laboratory.
- Documenting a corrective action that was never verified.
- Storing chemicals in unlabeled containers.
Regulatory Compliance and CLIA Standards
What this domain tests
This domain tests the CLIA framework itself: test complexity categories, certificate types, personnel qualifications for each complexity level, proficiency testing obligations, inspections, and enforcement - plus how accreditation fits underneath CLIA.
Framework
- CLIA '88 classifies tests as waived, moderate complexity (including provider-performed microscopy), or high complexity. A new test's default category comes from the FDA CLIA database; a laboratory cannot self-designate complexity.
- Certificate types: certificate of waiver, certificate for provider-performed microscopy, certificate of compliance, and certificate of accreditation. A CLIA certificate is required to perform any testing, including waived testing, and must match the testing actually performed.
- Personnel qualification pathways differ by complexity and role. For high-complexity testing, the director, technical supervisor, general supervisor, and testing personnel each have defined education and experience pathways in 42 CFR 493; verify the specific pathway rather than assuming a degree is sufficient.
- Proficiency testing: generally two events per year with five challenges per analyte; a score of 80% is passing for most analytes, with different rules for microbiology. PT referral is prohibited.
- Inspections occur biennially; accreditation organizations (CAP, The Joint Commission, COLA) provide deemed status, but CLIA remains the underlying authority.
- Enforcement escalates from condition-level deficiencies to plans of correction and sanctions, including suspension or revocation of the certificate.
Worked example
A physician office wants to add a test that is not on the waived list. Reasoning: first confirm the FDA CLIA complexity category; if it is moderate or high complexity, the laboratory must upgrade its certificate, meet the corresponding personnel and QC requirements (including two levels of QC per day and PT enrollment), and be inspected accordingly. Performing it under a certificate of waiver would be a compliance violation even if the method itself is simple.
Traps that cost marks
- Assuming a certificate of waiver exempts the laboratory from all CLIA requirements.
- Accepting a new method without checking its complexity category.
- Sharing or referring proficiency testing samples.
- Treating accreditation as a replacement for the CLIA certificate.
- Missing state licensure requirements that layer on top of CLIA.