Knowledge Base › Troubleshooting Atlas › H&E staining
Nuclear bubbling artifact
Also known as: nuclear bubbling, nuclear vacuolation
What it looks like
The nuclei appear to have small, rounded bubbles or vacuoles within them, giving a distorted appearance.
Where it usually appears: Commonly seen in paraffin-embedded tissues during H&E staining, particularly in poorly fixed specimens.
Likely causes
- Inadequate fixation leading to tissue shrinkage
- Overheating during processing or staining
- Inappropriate clearing agents
- Prolonged exposure to alcohols or xylene
Immediate checks
- Inspect fixation time and temperature
- Check processing temperatures
- Review clearing agent used
Corrective action
- Optimize fixation protocol
- Adjust processing temperatures and times
- Use appropriate clearing agents
Preventive action
- Ensure proper fixation of tissues
- Monitor processing conditions closely
- Train staff on staining protocols
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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