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HelpTest ID MUSK Muscle-Specific Kinase (MuSK) Autoantibody, Serum
Useful For
Diagnosis of autoimmune muscle-specific kinase (MuSK) myasthenia gravis
Second-order test to aid in the diagnosis of autoimmune myasthenia gravis when first-line serologic tests are negative
Establishing a quantitative baseline value for MuSK antibodies that allows comparison with future levels if weakness is worsening
Reporting Name
MuSK Autoantibody, SSpecimen Type
SerumSpecimen Required
Supplies: Sarstedt Aliquot Tube, 5 mL (T914)
Collection Container/Tube:
Preferred: Red top
Acceptable: Serum gel
Submission Container/Tube: Plastic vial
Specimen Volume: 1.5 mL
Collection Instructions: Centrifuge and aliquot serum into a plastic vial.
Specimen Minimum Volume
1 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum | Refrigerated (preferred) | 28 days | |
| Frozen | 28 days | ||
| Ambient | 72 hours |
Reference Values
≤0.02 nmol/L
Day(s) Performed
Monday through Friday
Report Available
3 to 10 daysPerforming Laboratory
Mayo Clinic Laboratories in Rochester
Test Classification
This test was developed using an analyte specific reagent. Its performance characteristics were determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the US Food and Drug Administration.CPT Code Information
86366
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| MUSK | MuSK Autoantibody, S | 51716-9 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| 64277 | MuSK Autoantibody, S | 51716-9 |
NY State Approved
YesMethod Name
Radioimmunoassay (RIA)
Forms
If not ordering electronically, complete, print, and send 1 of the following forms with the specimen:
-Neurology Specialty Testing Client Test Request (T732)
-General Request (T239)