Knowledge Base › Troubleshooting Atlas › Frozen section
Poor rapid-H&E staining on frozen sections
What it looks like
Staining appears faint or uneven with poor differentiation between tissue and background.
Where it usually appears: Commonly observed during the preparation of frozen sections for rapid diagnosis.
Likely causes
- Insufficient fixation time prior to freezing
- Inadequate temperature control during freezing
- Improper section thickness
- Incompatible mounting medium
- Expired or improperly stored reagents
Immediate checks
- Verify temperature of the cryostat
- Check fixation time before freezing
- Inspect section thickness
Corrective action
- Re-fix the tissue for the appropriate time
- Adjust cryostat settings for optimal temperature
- Re-stain with fresh reagents
Preventive action
- Standardize fixation protocols
- Regularly calibrate and maintain cryostat equipment
- Ensure reagents are within expiration dates
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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