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|Collection Instructions||List the specific antibody(-ies) to be tested for on the requisition.|
|Container type||Gold top|
|Amount to Collect||6 mL blood|
|Preferred volume||3 mL serum|
|Min. Volume||1 mL serum|
|Processing notes||Refrigerate sample|
|Synonyms||GM-1 antibodies; Asialo-GM1 antibodies; GQ1B; Anti-GM1 antibodies;|
|Additional information||Restricted to Neurology Service.
High titers are seen in > 90% of patients with multifocal motor neuropathy, and very high titers are particularly suggestive of a motor neuropathy. However, they may also be seen in amyotrophic lateral sclerosis, other lower motor neuron syndromes, and autoimmune disorders, and titers by themselves do not indicate the presence of a treatable motor neuron syndrome.
For specimens showing elevated IgM anti-GM1 antibodies, the antibody titers to a 17,000 MW neural protein (the Cy protein) and to the neural protein NP9 are also determined. High antibody titers to GM1 and to NP9 combined with low titers to Cy (Cy Ratio < 0.79) are 80- 90% specific for multifocal motor neuropathy or a lower motor syndrome; 90% of patients with high anti-GM1 levels and a Cy Ratio > 0.79 have Amyotrophic Lateral Sclerosis, peripheral neuropathy or other immune disorders.
|Last Updated||8/24/2011 12:20:09 PM|
If you have additional questions regarding this test, please call: 415-353-1667