Muscle-Specific Actin (MSA) by Immunohistochemistry
Also known as: MUSA IHC
Use
This test provides detection of muscle-specific actin in tissue specimens using immunohistochemical staining. It serves primarily as a stain-and-return technical service, aiding in the identification of muscle differentiation in tissues. It is valuable in pathology workups to support histologic evaluation of muscle origin or differentiation in lesions.
Special Instructions
Ordering is via electronic request or by using ARUP Immunohistochemistry Stain Form #32978 along with an ARUP client number. Refer to the ARUP Immunohistochemistry Stain Offerings brochure for ordering recommendation.
Limitations
This is a technical stain-and-return service only and does not provide interpretive results. Specimens unsuitable include non‑representative tissue types or depleted specimens. Frozen specimens are unacceptable.
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 (Fixed (Non-FFPE))
Volume
Not provided
Minimum Volume
Not provided
Container
Tissue transport kit (ARUP supply #47808)
Collection Instructions
Submit tissue block or 5 unstained (3‑ to 5‑micron thick) positively charged slides (minimum 2 slides); do not oven bake precut slides.
Storage Instructions
Protect paraffin block and/or slides from excessive heat; ship in cooled container during summer months.
Causes for Rejection
Non‑representative tissue type; depleted specimens
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | Indefinitely |
| Refrigerated | Indefinitely |
| Frozen | Unacceptable |