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Lab Test Dictionary

Myasthenia Gravis (MG) Evaluation with MuSK Reflex, Serum (MGMR)


Radioimmunoassay (RIA); Immunoassay (IA); Western Blot


Acetylcholine Receptor (Muscle AChR) Antibodies; Ach Receptor Ab; AChR Receptor Blocking Ab; Anti-Skeletal Muscle Antibodies; Binding, Blocking, and Modulating Abs; Blocking Ab GAD65 (Glutamic Acid Decarboxylase); Muscle End-Plate Antibodies; Myasthenia Gravis Antibodies; MuSK Myasthenia; Myoid Antibody; Neuronal Potassium Channel Ab; Potassium Channel Antibodies; Thymoma; VGKC; VGPC; Voltage-Gated Postassium Channel Ab

Specimen Type


Performing Lab

Mayo Medical Lab

Epic ID

Other Reference Test

Lab Test Days


Standard TAT

3-7 Days

Collection Information

Specimen Required

4-6 mL Blood

Container Type

Red Top (No Additive)

Collection Instructions

Patient should have no general anesthetic or muscle-relaxant drugs in the previous 24 hours prior to collection.

Processing Information - Lab Use Only

Transport Temperature


Specimen Stability

Room Temp: 72 Hours; Refrigerated: 28 Days; Frozen: 28 Days

Rejection Criteria

Gross hemolysis; Gross lipemia; Gross icterus

Test Volume Required

3 mL Serum

Minimum Test Volume

2 mL Serum

Included Tests

ACh Receptor (Muscle) Binding Ab, Striated (Striated Muscle Ab and ACh Receptor (Muscle) Modulating Ab. Reflex tests include: MuSK Autoantibody, GAD65 Ab Assay, CRMP-5-IgG Western Blot, AChR Ganglionic Neuronal Ab and Neuronal (V-G) K Channel Ab.

CPT Codes

86041, 86043, 86366