Laboratory Services

Myasthenia Gravis (MG) Evaluation, Pediatric, Serum

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Updated Test Information:

Test Description
Myasthenia Gravis (MG) Evaluation, Pediatric, Serum
Synonym(s)
MG Eval, Pediatric
Test ID
MGP1
General Information
Useful for:
Recommended for initial investigation of patients presenting at less than age 20 with a defect of neuromuscular transmission
Confirming that a recently acquired neurological disorder has an autoimmune basis
Distinguishing acquired myasthenia gravis from congenital myasthenic syndromes (persistently seronegative)
Providing a quantitative baseline for future comparisons in monitoring clinical course and response to immunomodulatory treatment
Specimen Type
Serum
Specimen Requirements
Red Top
Stability
Refrigerated (preferred) 28 days
Frozen 28 days
Ambient 72 hours
Unacceptable Specimen Conditions
Gross hemolysis Reject
Gross lipemia Reject
Gross icterus Reject
Methodology
Radioimmunoassay (RIA)
Estimated TAT
3-5 days
Testing Schedule
Monday-Sunday
Test Includes
MGEPI MG Pediatric Interpretation
ARBI ACh Receptor (Muscle) Binding Ab
ARMO ACh Receptor (Muscle) Modulating Ab
CPT Code(s)
83519x2
Minimum Sample Volume
1.5 mL
Reference Range
ACh RECEPTOR (MUSCLE) BINDING ANTIBODY
< or =0.02 nmol/L
ACh RECEPTOR (MUSCLE) MODULATING ANTIBODIES
0-20% (reported as __% loss of AChR)
Performing Lab
Mayo
LOINC Code(s)
11034-6, 30192-9, 69048-7