Web: | mayocliniclabs.com |
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Email: | mcl@mayo.edu |
Telephone: | 800-533-1710 |
International: | +1 855-379-3115 |
Values are valid only on day of printing. |
Diagnosis for autoimmune myasthenia gravis (MG) in adults and children
Distinguishing autoimmune from congenital MG in adults and children
Establishing a quantitative baseline value that allows comparison with future levels if weakness is worsening
Seropositivity confirms a clinical or electrophysiologic diagnosis of autoimmune myasthenia gravis (MG).
Second-line muscle-specific kinase (MuSK) antibody test positivity confirms a clinical or electrophysiologic diagnosis of autoimmune MG where first-line serological tests (acetylcholine receptor: AChR binding and modulating antibodies) are negative.
Test ID | Reporting Name | Available Separately | Always Performed |
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MGRMI | MG Interpretive Comments | No | Yes |
ARBI | ACh Receptor (Muscle) Binding Ab | Yes | Yes |
STR | Striational (Striated Muscle) Ab, S | Yes | Yes |
ARMO | ACh Receptor (Muscle) Modulating Ab | No | Yes |
Test ID | Reporting Name | Available Separately | Always Performed |
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MUSK | MuSK Autoantibody, S | Yes | No |
GD65S | GAD65 Ab Assay, S | Yes | No |
GANG | AChR Ganglionic Neuronal Ab, S | No | No |
VGKC | Neuronal (V-G) K+ Channel Ab, S | No | No |
CRMWS | CRMP-5-IgG Western Blot, S | Yes | No |
If acetylcholine receptor (AChR) modulating antibodies are > or =90% and striational antibodies are > or =1:120, then ganglionic AChR neuronal autoantibody, glutamic acid decarboxylase autoantibody, neuronal voltage-gated potassium channel autoantibody, and collapsin response-mediator protein-5 (CRMP-5)-IgG Western blot will be performed at an additional charge.
If AChR-binding antibodies are < or =0.02 and AChR-modulating antibodies are < or =20%, then muscle-specific kinase (MuSK) autoantibody will be performed at an additional charge.
See Myasthenia Gravis Evaluation with MuSK Reflex Algorithm in Special Instructions.
ARBI, ARMO, GANG, VGKC: Radioimmunoassay (RIA)
STR: Enzyme Immunoassay (EIA)
CRMWS: Western Blot