Myelin Associated Glycoprotein (MAG) Ab, IgM
Test Mnemonic
MAGIGM
CPT Codes
- 83516 - QTY (1)
LOINC ®
17314-6
Aliases
- MAG IgM
- Myelin Associated Glycoprotein
Performing Laboratory
ARUP
Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 1 mL | Serum | SST (Gold) | Refrigerated | Separate serum from cells ASAP or within 2 hours of collection and transfer into standard aliquot tube. |
Minimum Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 0.1 mL |
Stability
| Environmental Condition | Description |
|---|---|
| Ambient | After separation from cells: 2 days |
| Refrigerated | After separation from cells: 2 weeks |
| Frozen | After separation from cells: 1 year |
Days Performed
Tue, Thu, Sat
Turnaround Time
2 - 5 days
Methodology
| Name | Description |
|---|---|
| Semi Quantitative Enzyme Linked Immunosorbent Assay |
Reference Range
| Myelin Associated Glycoprotein (MAG) Ab, IgM | |||||
|---|---|---|---|---|---|
| Sex | Age From | Age To | Type | Range | Range Unit |
| MAG Antibody, IgM: < 1000 Titer Units |
Special Info
Hemolyzed, severely lipemic, contaminated or heat-inactivated specimens are unacceptable. Urine will be rejected. This test is New York DOH approved.
Clinical Info
This is a stand-alone test for autoimmune neuropathies. The test by itself is not diagnostic, and it should be used in conjunction with other clinical parameters to confirm disease. An elevated IgM antibody concentration > 999 Titer Units (TU) against myelin-associated glycoprotein (MAG) suggests active demyelination in peripheral neuropathy. A normal concentration (< 999 TU) generally rules out an anti-MAG antibody-associated peripheral neuropathy.