Laboratory Management
Laboratory management questions blend regulatory knowledge with operational judgment. Know the framework: CLIA defines test complexity (waived, moderate, high) and requires a certificate, director qualifications, survey, proficiency testing for regulated analytes, and competency assessment (semiannual in the first year, annual thereafter). CAP accreditation adds checklists and peer inspection. Distinguish method validation, required before a laboratory introduces a test (accuracy, precision, analytical measurement range, reference interval, interference, and full validation for laboratory-developed tests), from calibration verification, which confirms a validated method remains stable, and from daily quality control.
QC interpretation is heavily tested: Levey-Jennings charts with Westgard multirules. The 1-3s rule rejects (random error); 2-2s rejects two consecutive points beyond 2 SD on one or two levels (systematic error); R-4s rejects (random); 4-1s and 10x reject (systematic). Sigma metrics describe process capability. Root cause analysis, FMEA, and PDSA cycles recur in patient-safety vignettes.
Traps
- Treating a 1-2s violation as a rejection; it is only a warning.
- Handling proficiency testing specimens differently from patient specimens, which is prohibited.
- Confusing calibration with calibration verification.
- Assuming waived tests need no QC; manufacturer instructions and good practice still apply.
- Neglecting competency documentation for point-of-care operators outside the main laboratory.
Worked example. Level 1 QC reads +2.6 SD and level 2 reads +2.4 SD in the same run. This is a 2-2s violation across two levels, indicating systematic error: stop reporting patient results, inspect reagents and calibration, recalibrate if needed, and repeat QC before resuming.