Update Type: Test Resumed
Test Updated: 12/29/2021
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

Test Details
Days Set Up
Tuesday, Thursday
Analytic Time

3 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
NY State Approved
No