Update Type: CPT Code Change
Test Updated: 12/06/2023
Test Overview
Test Methodology

Radioimmunoassay (RIA)

Test Usage

Monitoring disease progression in Myasthenia Gravis (MG) or response to immunotherapy.

Reference Range *

Less than or equal to 0.02 nmol/L

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Limitations

Positive results sometimes found in patients with Lambert-Eaton myasthenic syndrome and frequently found with autoimmune liver disease. The magnitude of the results is not useful in predicting the severity of disease.

Test Details
Days Set Up
Monday - Sunday
Analytic Time

4 - 7 days

Soft Order Code
ARAB
MiChart Code
ACh receptor (Muscle) Binding Ab
Synonyms
  • AChR Receptor (Muscle) Binding Antibody
  • Acetylcholine Receptor (Muscle) Binding Antibody
  • AChR Antibodies
  • Muscle AChR Antibodies
  • AChR Binding Antibody
  • Myasthenia Gravis Antibody
  • ARAB
  • ACETYLCHOLINE RECEPTOR AB
  • ACh Receptor Binding Antibody
Laboratory
Sendout
Reference Laboratory
Mayo ARBI (8338)
Section
Special Testing
Specimen Requirements
Collection Instructions

Collect blood in a red top or SST tube. Centrifuge, aliquot serum into plastic vial and refrigerate. Other acceptable specimens include spinal fluid, thymic fluid, and heparinized plasma.

Normal Volume
1.5 mL serum
Minimum Volume
1 mL serum
Additional Information

Test sent to Mayo Medical Laboratories.

Billing
CPT Code
86041
Fee Code
32034
LOINC
5037-7