Myasthenia Gravis Panel 2 with Reflex to MuSK Antibody
Test Code
93859
86041, 86042, 86043
Clinical Significance
Myasthenia Gravis Panel 2 with Reflex to MuSK Antibody - Myasthenia gravis (MG) is an autoimmune disorder affecting the neuromuscular junction. 80% of patients with generalized MG have serum antibodies to AChR - Blocking, Binding, or Modulating. Antibodies to MuSK make up a variable proportion of the remaining 20%.
Test Resources
Clinical Focus
Myasthenia Gravis and AutoantibodiesTest Details
Acetylcholine Receptor Blocking Antibody
Acetylcholine Receptor Binding Antibody
Acetylcholine Receptor Modulating Antibody
If AChR blocking is <15% of inhibition, AChR binding is ≤0.30 nmol/L, and AChR modulating is <32% binding inhibition, then MuSK Antibody Test will be performed at an additional charge (CPT code(s) 86366).
Acetylcholine Receptor Binding Antibody
Acetylcholine Receptor Modulating Antibody
If AChR blocking is <15% of inhibition, AChR binding is ≤0.30 nmol/L, and AChR modulating is <32% binding inhibition, then MuSK Antibody Test will be performed at an additional charge (CPT code(s) 86366).
Methodology
Immunoassay (IA)
This test was developed and its analytical performance characteristics have been determined by Quest Diagnostics. It has not been cleared or approved by FDA. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.
Reference Range(s)
See Laboratory Report
Preferred Specimen(s)
3 mL serum
Minimum Volume
0.7 mL
Transport Container
Transport tube
Transport Temperature
Refrigerated (cold packs)
Specimen Stability
- Room temperature: 7 days
Refrigerated: 14 days
Frozen: 30 days
Reject Criteria
Hemolysis • Lipemia • Microbially contaminated
Setup Schedule
3 mL serum
0.7 mL
Transport tube
Refrigerated (cold packs)
Room temperature: 7 days
Refrigerated: 14 days
Frozen: 30 days
Refrigerated: 14 days
Frozen: 30 days
Hemolysis • Lipemia • Microbially contaminated