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HelpTest Code IHC Mismatch Repair (MMR) Protein Immunohistochemistry Only, Tumor
Specimen Type
VariesNecessary Information
Pathology report (final or preliminary) at minimum containing the following information must accompany specimen for testing to be performed:
1. Patient name
2. Block number-must be on all blocks, slides, and paperwork (can be handwritten on the paperwork)
3. Tissue collection date
4. Source of the tissue
Specimen Required
Tumor tissue is required.
Preferred:
Specimen Type: Tissue block
Collection Instructions: Submit formalin-fixed, paraffin-embedded tissue block.
Acceptable:
Specimen Type: Tissue slide
Slides: 1 Hematoxylin and eosin stained and 10 unstained
Collection Instructions: Submit 1 slide stained with hematoxylin and eosin and 10 unstained, nonbaked slides (5-micron-thick sections) of tumor tissue.
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Varies | Ambient (preferred) | ||
| Refrigerated | |||
Reject Due To
| Specimens that have been decalcified (all methods) Specimens that have not been formalin-fixed, paraffin-embedded Bone marrow in EDTA |
Reject |
Reference Values
An interpretive report will be provided.
Day(s) Performed
Varies
Report Available
5 to 8 daysSpecimen Retention Time
FFPE tissue: Unused portions of FPPE blocks will be returned. Unused, unstained slides: 5 years; Stained slides: Indefinitely.Performing Laboratory
Mayo Clinic Laboratories in Rochester
CPT Code Information
88341 MLH1, MLH2, or MLH6 (if appropriate)
88342 PMS2 (if appropriate)