Proficiency testing is external, blinded sample analysis to evaluate a lab’s performance. It is required by which programs?

Proficiency testing is external, blinded sample analysis to evaluate a lab’s performance. It is required by which programs?

• A. CLIA/CAP
• B. ISO 9001
• C. EPA
• D. OSHA

Answer: (A)

Proficiency testing is a form of external quality assessment that evaluates a lab’s performance by analyzing blinded specimens from an outside source. In clinical laboratory settings, this external, blinded comparison is required to ensure accuracy and consistency across laboratories. The regulatory framework that enforces this is CLIA, which mandates participation in approved proficiency testing programs for many test categories to protect patient safety. CAP accreditation also requires ongoing proficiency testing as part of maintaining accreditation, reinforcing the obligation to demonstrate reliable performance. Other options don’t specifically mandate this external, blinded evaluation for clinical labs: ISO 9001 is a general quality management standard, while EPA and OSHA focus on environmental and workplace safety.