Anti-MAG antibody test
Quick answer: This blood test looks for antibodies against myelin-associated glycoprotein (MAG), a protein in the coating of nerves. Doctors usually order it when they suspect a slowly worsening nerve disorder (neuropathy) linked to an abnormal blood protein.
- SampleBlood
- TakesAbout 5 minutes
- Before the testNo special preparation is usually needed.
How the test is done
- 1A nurse confirms your name and test
- 2A vein on your arm is cleaned
- 3A needle collects a tube of blood
- 4The lab looks for IgM antibodies to myelin-associated glycoprotein
What your results can mean
Reading your report
A positive result does not by itself confirm a disease, because some healthy people test positive; your doctor reads it with your symptoms and other tests.
If the result is outside the usual range
A positive result can be seen with a slowly worsening, mostly sensory neuropathy linked to an IgM paraprotein. Doctors may then look for a blood condition causing the paraprotein.
Who usually has this test
Older adults with slowly progressive numbness, tingling or unsteadiness in the feet and an IgM protein band in the blood.
Risks and aftercare
No special aftercare; you may have mild soreness at the needle site.
Names and options
Also called: MAG antibody, myelin-associated glycoprotein antibody
Listed by the hospital as
- MAG ANTIBODIES
Questions about this test
What is an IgM paraprotein?
It is an abnormal antibody made in large amounts by a single group of cells. It can be harmless or linked to a blood condition, so doctors usually monitor it.
How does anti-MAG neuropathy usually feel?
It often starts with numbness and tingling in the feet, poor balance and sometimes a hand tremor. It tends to progress slowly over years.
Will I need other tests after a positive anti-MAG?
Often yes. Doctors usually arrange protein tests in the blood and urine, nerve conduction studies and sometimes a haematology review.
Related tests
Tamara Hospital & IVF Centre, Rajajinagar
34/3, 10th Cross Road, opp. Vardhaka Sardar Patel School, 1st N Block, 2nd Stage, Rajajinagar, Bengaluru 560010
The hospital is open 24 hours. Call before you come to check the timing for your scan or sample collection.
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This page explains each test in general terms so you know what to expect. It is not medical advice: your doctor decides which tests you need and what your results mean. Reference ranges differ between laboratories. Updated 4 November 2026.