Proficiency Testing (PT) is one of the most regulated elements of laboratory compliance, and for good reason: it directly assesses your lab’s ability to produce accurate, reliable results.
Unfortunately, labs often file their PT scores and move on without review, reflection, or remediation. CLIA requires that PT results are formally reviewed by the Laboratory Director and that unsatisfactory results are thoroughly investigated and corrected.
In this post, we’ll break down what’s required, what inspectors are looking for, and how to create a compliance-safe workflow for PT result review and follow-up.
What CLIA Requires for PT Review
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Lab Director (or designee) reviews all PT results
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Documentation of review must be signed and dated
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Corrective action plans must be written for:
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Unsatisfactory scores
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Incorrect or outlier results
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Any systemic issues identified
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Remediation steps must be traceable and effective
Even if your PT results are good, you still need to document that they were formally reviewed.
What Gets Labs Cited
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PT results filed with no evidence of review
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No signatures, dates, or lab director involvement
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No documentation of investigations after failures
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A score of “unsatisfactory” with no record of follow-up
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Recurring PT problems without remediation
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Failing the same analyte multiple times
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Staff unaware of PT results or process
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Inspectors may ask techs about past PT events
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How to Comply and Build a Culture of Quality
1. Create a Formal PT Review Process
For each PT event:
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Assign responsibility for collecting and compiling results
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Set a deadline for review by the lab director
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Use a standardized form for documenting:
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Review summary
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Any discrepancies
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Sign-off and date
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This should be part of your broader quality management system.
2. Investigate All Failures or Flags
An “unsatisfactory” PT result should trigger:
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A documented root cause analysis
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Review of instrument function, reagent integrity, staff technique, etc.
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Retraining or SOP revisions if necessary
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Documentation of what was done and who approved it
3. Hold a PT Review Meeting
Once each cycle, host a brief team review to:
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Summarize PT outcomes
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Discuss errors and learning points
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Reinforce best practices for PT specimen handling
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Encourage questions and transparency
This makes PT a team learning opportunity and not just a task to check off.
4. Track PT Trends Over Time
Recurring errors on the same analyte or platform can indicate:
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Hidden competency gaps
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Instrument issues
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Calibration or QC process failures
Trend reports strengthen your case for proactive corrections and show inspectors you’re monitoring performance holistically.
Why This Matters Beyond the Checklist
PT results are your lab’s report card and they can be publicly compared to peer labs and carefully scrutinized by inspectors. A robust review process shows that your lab:
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Takes quality seriously
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Uses PT for improvement, not just compliance
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Engages leadership in day-to-day performance oversight
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Proactively prevents future issues
Common Lab Questions
Q: If we passed, do we still need a review?
Yes, passing results must be formally reviewed, signed, and dated.
Q: What if PT results aren’t back before the inspection?
Keep documentation of previous reviews and note any pending results. Be ready to show a consistent pattern of documented reviews.
Q: Can a supervisor review instead of the lab director?
Yes but only if designated in writing and appropriately qualified under CLIA.
