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GM1 Antibody

Published: July 27, 2026Updated: August 25, 2026

The GM1 antibody test measures the presence and levels of antibodies against the ganglioside GM1 in the blood, which are often associated with certain neurological disorders.

Quick summary

GM1 antibody levels help diagnose neurological conditions like multifocal motor neuropathy.

Medically reviewed by WellAlly Editorial TeamLast reviewed August 25, 2026Editorial policy

Key facts at a glance

Units
titer
Clinical utility
diagnostic
Result kind
qualitative
FDA-cleared
Roche Anti-GM1, Athersys GM1 Ab
interpretation: {"text":"≤1 titer units indicates no significant presence of GM1 antibodies.","label":"Normal"}; {"text":">1 titer units may suggest an autoimmune neurological disorder.","label":"Elevated"}

GM1 ganglioside is a component of cell membranes, particularly abundant in the nervous system. Antibodies against GM1 can disrupt nerve function and are often found in patients with neurological autoimmune disorders.

The GM1 antibody test is primarily used to aid in the diagnosis of conditions such as multifocal motor neuropathy (MMN) and lower motor neuron disease. Elevated levels of these antibodies can support a diagnosis when clinical symptoms are present.

A titer of ≤1 is considered the reference range for normal levels of GM1 antibodies. Higher titers may indicate the presence of an underlying neurological condition that requires further investigation.

Frequently asked questions

What is the purpose of the GM1 antibody test?
The test helps diagnose autoimmune neurological conditions by detecting antibodies that target nerve cells.
What does a high GM1 antibody titer mean?
A high titer may indicate an increased risk of conditions like multifocal motor neuropathy.
  1. 1
    Ganglioside Antibodies in Neurological DiseasesSource
  2. 2
    Multifocal Motor Neuropathy DiagnosisSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 25, 2026. · Read our editorial policy