Knowledge Base › Troubleshooting Atlas › Special stains
Perls (iron) stain weak or negative
What it looks like
Staining shows weak or absent blue granules indicating iron deposits. Tissue may appear pale or non-reactive.
Where it usually appears: Commonly seen in liver, spleen, or bone marrow biopsies where iron deposits are expected.
Likely causes
- Insufficient incubation time with the staining solution
- Inadequate fixation of the tissue sample
- Improper pH of the staining solution
- Expired or improperly stored reagents
- Contamination of reagents
Immediate checks
- Verify the age and storage conditions of reagents
- Check the pH of the staining solution
- Examine the fixation quality of the tissue sample
Corrective action
- Increase incubation time with the staining solution
- Re-fix the tissue samples if fixation was inadequate
- Prepare fresh staining solutions
Preventive action
- Regularly check and document reagent expiration dates
- Ensure proper storage conditions for reagents
- Follow SOP for tissue fixation meticulously
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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