Test system failures happen. It’s how your lab responds to them that determines whether you stay compliant or end up with a citation.
According to CLIA and CAP, labs must document every test system failure, investigate the root cause, and implement corrective and preventive actions (CAPA). But some labs either fail to document these incidents at all or fail to close the loop on follow-up.
This post outlines what regulators expect when things go wrong, the most common reasons labs are cited, and how to build a transparent, auditable process for handling instrument and process failures.
What Inspectors Expect from Your Lab
When a test system fails your lab is expected to:
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Document the failure
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Stop testing or invalidate results, if applicable
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Investigate and determine root cause
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Implement corrective actions
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Track preventive measures to avoid recurrence
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Retain all related documentation
CLIA surveyors and CAP inspectors will expect and want to see proof that failures are logged, addressed, and reviewed.
What Labs Get Cited For
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No Failure Log Exists
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Instrument errors are handled informally and forgotten
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Failures are never recorded in any tracking system
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Root Cause Is Vague or Missing
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Documentation says “recalibrated” or “retested” without deeper investigation or further detail
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No evidence of analysis beyond what’s obviously visible
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Corrective Action Not Taken or Not Tracked
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Fixes are applied but not documented
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Preventive steps (e.g., retraining, SOP changes) are skipped
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No Follow-Up or Closure
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Open issues stay unresolved for weeks
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No confirmation that the problem won’t happen again
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How to Build a Bulletproof System Failure Process
1. Use a Standard Logging Template
Track all failures consistently with a form that captures:
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Date and time of failure
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Instrument/test system
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Description of event
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Initial response taken
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Root cause analysis summary
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Corrective actions
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Preventive actions (e.g., SOP updates, retraining)
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Final resolution date
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Sign-off by QA or supervisor
2. Train Staff to Escalate Early
Make sure all lab personnel:
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Know how to identify a system failure
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Understand when to pause testing
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Are empowered to report issues without fear of blame
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Know how and where to document the issue
Remember, compliance is everyone’s job, not just the compliance team.
3. Schedule CAPA Reviews
Do a monthly review of open and closed failure logs to identify:
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Recurring issues by instrument or shift
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Gaps in root cause investigations
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CAPAs that are overdue or incomplete
Assign follow-ups and create accountability with a shared QA dashboard or platform to easily visualize the quantity and type of problems you wish to address.
4. Incorporate Into Internal Audits
During your routine audits or mock inspections:
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Ask to see the test failure log
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Review whether CAPAs were effective
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Cross-check logs against maintenance records, QC events, or PT failures
This reinforces a culture of continuous improvement.
Why This Matters for Patients and Compliance
Untracked system failures that go untracked can also compromise test accuracy, delay results, and harm patient care. Worse, they often indicate deeper issues in process or culture.
A proactive approach:
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Enhances trust in your lab’s quality
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Shows inspectors that you’re diligent and accountable
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Creates a safer environment for both patients and staff
Common Lab Questions
Q: What counts as a test system failure?
Anything that impacts test validity including instrument errors, calibration failures, QC failures, software crashes, sample handling issues, etc.
Q: We fixed our outstanding issue. Do we still need a CAPA?
Yes. You need to document the fix and analyze how to prevent recurrence.
Q: What’s the difference between corrective and preventive action?
Corrective = fixing the current issue.
Preventive = changing the system to keep it from happening again.
