Keratin 903 (K903) High Molecular Weight by Immunohistochemistry
Also known as: K903 IHC
Use
This test provides immunohistochemical staining for high molecular weight cytokeratins (Keratin 903, also known as CK903), which assists in identifying squamous or basal epithelial differentiation through detection of high-molecular-weight keratin expression; it serves as a technical 'stain and return' service to support histopathologic evaluation.
Special Instructions
Submit via electronic request or, if electronic ordering is unavailable, use ARUP Immunohistochemistry Stain Form (#32978) with an ARUP client number. This is a technical service only; performed Monday through Friday as a stain and return service.
Limitations
Not provided.
New York Approved
Methodology
Immunoassay (IHC)
Biomarkers
LOINC Codes
- 94736-6
Result Turnaround Time
1-3 days
Related Documents
For more information, please review the documents below
Specimen
Tissue (FFPE)
Volume
Not provided
Minimum Volume
Not provided
Container
tissue transport kit (ARUP supply #47808)
Collection Instructions
Formalin fix (10 percent neutral buffered formalin) and paraffin embed specimen (cells must be prepared into a cellblock). Protect paraffin block and/or slides from excessive heat. Transport tissue block or 5 unstained (3‑ to 5‑micron thick sections), positively charged slides. (Min: 2 slides). If sending precut slides, do not oven bake.
Storage Instructions
Room temperature or refrigerated. Ship in cooled container during summer months.
Causes for Rejection
Specimens submitted with non‑representative tissue type. Depleted specimens.
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | Indefinitely |
| Refrigerated | Indefinitely |
| Frozen | Unacceptable |