Update Type: Test Down or Delayed
Test Updated: 04/26/2023
Test Overview
Test Methodology
RIA
Test Usage
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.
Reference Range *
< or =0.02 nmol/L
* Reference ranges may change over time. Please refer to the original patient report when evaluating results.
Test Details
Days Set Up
Monday - Friday
Analytic Time
4 - 12 days
Soft Order Code
MMUSK
MiChart Code
MuSK Antibody, Mayo Sendout
Synonyms
- MUSK
- MuSK Ab
- Muscle-specific receptor tyrosine kinase (MuSK) Antibody
Laboratory
Sendout
Reference Laboratory
Mayo MUSK
Section
Special Testing
Specimen Requirements
Collection Instructions
Collect specimen in a red top (preferred) or SST tube. Centrifuge, aliquot serum into a plastic vial and refrigerate.
Normal Volume
1.5 mL serum
Minimum Volume
1 mL serum
Storage Temperature
Room temperature: 72 hours; Refrigerated: 28 days; Frozen: 28 days.
Additional Information
Test sent to Mayo Medical Laboratories.
Billing
CPT Code
83519
Fee Code
21611