Knowledge Base › Troubleshooting Atlas › Quality & QC
Traceability gaps between block and slide
What it looks like
Slides do not match the corresponding blocks; labels may be incorrect or missing.
Where it usually appears: Typically observed during routine quality control checks or before reporting results.
Likely causes
- Labeling errors during embedding
- Misplacement of slides
- Human error in tracking samples
- Inadequate documentation practices
Immediate checks
- Verify labels on blocks and slides
- Check the logbook for entries related to the samples
- Inspect storage areas for misplaced items
Corrective action
- Re-label any mismatched slides or blocks immediately
- Document discrepancies and notify supervisor
- Re-evaluate the tracking system for accuracy
Preventive action
- Implement a double-check labeling system
- Train staff on proper documentation procedures
- Regular audits of sample tracking processes
This atlas is for educational purposes for laboratory professionals. It does not replace your institutional SOPs, manufacturer instructions, validated protocols or pathologist judgment. Adapt any action to your laboratory and equipment.
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