MAG Antibody, IgM
Label Mnemonic: MAG
Epic Lab Code: LAB3533
Downtime Form: A-1a Miscellaneous Request
Commercial Mail-out Laboratory
5231 RCP
356-8593
Specimen(s):
Serum
Collection Medium:
Red top tube 5 mL (Clot Activator)
Minimum:
Preferred Minimum: 1.0 mL serum
Absolute Minimum: 0.1 mL serum
Rejection Criteria:
Urine. Contaminated, heat inactivated, hemolyzed, severely lipemic specimens.
Testing Schedule:
Weekly
Turn Around Time:
1-4 days upon receipt at reference laboratory
Reference Range:
Less than 1000 Titer Units (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.
Methodology:
Semi-Quantitative Enzyme-Linked Immunosorbent Assay
CPT Code:
83516