Which organization monitors proficiency testing results under CLIA?

• A. CMS
• B. The Joint Commission
• C. CDC
• D. FDA

Answer: (B)

Under CLIA, the organization that directly monitors proficiency testing results for labs is an approved accrediting body that conducts CLIA surveys. The federal agency sets the rules, but it relies on recognized accreditors—such as The Joint Commission—to review a laboratory’s proficiency testing performance during surveys and ensure ongoing CLIA compliance. This is why The Joint Commission is the correct focus here: it actively monitors PT results for labs it accredits to verify they meet CLIA requirements. The other options describe roles at different levels or in different areas (for example, CMS administers CLIA itself, while FDA and CDC have related but distinct functions) and do not perform this routine monitoring for accredited labs in the same way.