Special Stain, Congo Red
Also known as: CONGO R SS
Use
The Congo Red special stain is used in histopathology to detect amyloid deposits in tissue specimens. Amyloid characteristically exhibits apple‑green birefringence under polarized light after staining, aiding in diagnostic evaluation of amyloidosis and related conditions.
Special Instructions
Not provided.
Limitations
Frozen specimens are unacceptable. Specimens that are depleted or do not contain representative tissue are unacceptable. Slides and blocks must be formalin‑fixed and paraffin‑embedded (cells must be in cell blocks). Interpretation is technical only; no clinical interpretation is provided.
New York Approved
Methodology
Other
Biomarkers
LOINC Codes
- 10782-1 - CR Stn Tiss
Result Turnaround Time
1-5 days
Related Documents
For more information, please review the documents below
Specimen
Tissue (Fixed (Non-FFPE))
Volume
Not provided
Minimum Volume
Min: 1 slide
Container
Tissue transport kit (ARUP supply #47808)
Collection Instructions
Transport tissue block or 2 unstained (8‑ to 10‑micron thick), positively charged slides.
Causes for Rejection
Nonrepresentative tissue type; depleted specimens; frozen specimens.
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | Indefinitely (Ambient) |
| Refrigerated | Indefinitely |
| Frozen | Unacceptable |
Other tests from different labs that may be relevant