Myelin associated glycoprotein (MAG) antibody, IgM

Alphabetical Test listing

Myelin associated glycoprotein (MAG) antibody, IgM-994

Test name:

Test number:

994

Excellian order number:

LAB994

Abbreviation:

MSO

Alternate names:

MAG Ab
MAG Antibody
MAG Antibody by ELISA
MAG IgM

Specimen type:

Serum

Collection container:

Gold serum separator (SST) tube

Volume:

1.0 mL

Minimum volume:

0.1 mL

Collection instructions:

Immediately following collection, mix sample by gently inverting 5 times

Processing instructions:

Allow sample to clot for a minimum of 30 minutes
Spin within two (2) hours of sample collection

Transport container:

Gold serum separator (SST) tube

Transport and stability:

Refrigerated (preferred) – 2 weeks

Ambient – 48 hours

Frozen – 1 year

Reason for rejection:

Urine
Contaminated sample
Heat inactivated sample
Hemolysis
Severe lipemia

Performing lab:

ARUP (0051285) via Labcorp (009985): R-NX

Days set up:

Tu, Th, Sa

TAT:

4 - 6 days

Method:

Semi-Quantitative Enzyme-Linked Immunosorbent Assay (SQ-ELISA)

Reference ranges:

<1000 TU

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.

CPT codes:

83516

Date created:

08/13/2021

Review date:

12/15/2023