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Myelin Associated Glycoprotein (MAG) Antibody, IgM
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Ordering Recommendation
Stand-alone test for autoimmune neuropathies. Test by itself is not diagnostic and should be used in conjunction with other clinical parameters to confirm disease.
Mnemonic
Methodology
Semi-Quantitative Enzyme-Linked Immunosorbent Assay
Performed
Tue, Thu, Sat
Reported
1-4 days
New York DOH Approval Status
Specimen Required
Serum separator tube.
Separate serum from cells ASAP or within 2 hours of collection. Transfer 1 mL serum to an ARUP Standard Transport Tube. (Min: 0.1 mL)
Refrigerated.
Urine. Contaminated, heat inactivated, hemolyzed, severely lipemic specimens.
After separation from cells: Ambient: 48 hours; Refrigerated: 2 weeks; Frozen: 1 year
Reference Interval
Less than 1000 TU
Interpretive Data
An elevated IgM antibody concentration greater than 999 TU against myelin-associated glycoprotein (MAG) suggests active demyelination in peripheral neuropathy. A normal concentration (less than 999 TU) generally rules out an anti-MAG antibody-associated peripheral neuropathy.
TU=Titer Units
This test was developed and its performance characteristics determined by ARUP Laboratories. It has not been cleared or approved by the US Food and Drug Administration. This test was performed in a CLIA certified laboratory and is intended for clinical purposes.
Laboratory Developed Test (LDT)
Note
Hotline History
CPT Codes
83516
Components
| Component Test Code* | Component Chart Name | LOINC |
|---|---|---|
| 0051285 | MAG Antibody, IgM Elisa | 17314-6 |
Aliases
- MAG Ab
- MAG Antibody
- MAG Antibody by ELISA
- MAG IgM
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