Epic Code LAB1230031 Ganglioside Antibody Panel, Serum
Additional Codes
Mayo Code: GM1B
Performing Laboratory
Mayo Clinic Laboratories in RochesterUseful For
Supporting the diagnosis of an autoimmune neuropathy
Specimen Type
SerumSpecimen Required
Collection Container/Tube:
Preferred: Red top
Acceptable: Serum gel
Submission Container/Tube: Plastic vial
Specimen Volume: 1 mL
Collection Instructions: Centrifuge and aliquot serum into a plastic vial.
COLLECTION NOTE: Volumes listed are in serum or plasma, draw approximately 2 1/2 times the requested volume in whole blood.
Special Instructions
Specimen Minimum Volume
0.5 mL
Specimen Stability Information
Specimen Type | Temperature | Time | Special Container |
---|---|---|---|
Serum | Refrigerated (preferred) | 28 days | |
Frozen | 28 days | ||
Ambient | 72 hours |
Reject Due To
Gross hemolysis | Reject |
Gross lipemia | Reject |
Gross icterus | Reject |
Day(s) Performed
Tuesday, Thursday
Reference Values
Profile Information:
IGG_M: Negative
IGM_M: Negative
IGG_A: Negative
IGM_A: Negative
IGG_D: Negative
IGM_D: Negative
Reflex Information:
IGMTS: <1:2000
IMMTS: <1:4000
IGATS: <1:16000
IMATS: <1:8000
IGDTS: <1:2000
IMDTS: <1:2000
Clinical Information
Neuropathy patients have variable sensory disturbance (loss or exaggerated sensation including with pain), weakness and autonomic involvements (sweat abnormalities, gastrointestinal dysfunction, and lightheadedness on standing). These symptoms are a result of injury to the distal nerves, roots, and ganglia or their gathering points (nerve plexus in the thighs and arms). Patients may have symmetric or asymmetric involvements of the extremities, trunk, and head including extraocular muscles. Subacute onsets and asymmetric involvements favor inflammatory or immune causes over inherited or metabolic forms. Depending on the specific inflammatory or immune mediated causes other parts of the nervous system may also be affected (brain, cerebellum, spinal cord). Nerve conductions and needle electromyography can help to classify the neuropathy as either: 1) primary axonal; 2) primary demyelinating; or 3) mixed axonal and demyelinating.
Among the immune-mediated peripheral neuropathies, autoantibodies to gangliosides represent an important class of noncancer-associated autoimmune peripheral neuropathies. Gangliosides are glycosphingolipids that contain sialic acid and are present in many cell types most abundantly within neural tissues along their linings (myelin). Depending on the specific ganglioside autoantibody found and the antibody titer, in the appropriate clinical context, these findings may be supportive of a specific clinical diagnosis and may also be prognostic for treatment response.(1,2)
Specifically, in multifocal motor neuropathy (MMN) and multifocal acquired demyelinating sensory and motor (MADSAM) neuropathy, also known as Lewis-Sumner syndrome or multifocal chronic immune demyelinating polyradiculoneuropathy (CIDP), the presence ganglioside autoantibodies, particularly high-titer GM1-IgM autoantibodies, maybe supportive of the diagnosis in the correct clinical context. Furthermore, ganglioside seropositivity has been associated with favorable response to immunotherapy amongst patients suspected to have MMN during the initial clinical evaluation.(1)
Additionally, the presence of ganglioside antibodies may support a diagnosis of Guillain-Barre syndrome (GBS) in the appropriate clinical context.(3) GBS is one class of autoimmune peripheral neuropathies, and comprises a spectrum of disorders including acute inflammatory demyelinating polyradiculoneuropathy, acute motor axonal neuropathy, and acute motor and sensory axonal neuropathy. This class of autoimmune neuropathies is generally characterized by an acute onset. Although the diagnosis of these disorders is dependent on clinical evaluation and electrophysiologic studies, assessment of ganglioside antibodies can further support the diagnosis.
Cautions
Positive titer values less than 1:16,000 may be found in motor neuron disease, monoclonal gammopathy of uncertain significance (MGUS), and healthy individuals. High titers are very specific of an autoimmune neuropathy.
This test is not diagnostic and should be interpreted in the appropriate clinical context.
This test does not include testing for GD1a or GQ1b autoantibodies.
Interpretation
High titers (>1:8,000) favor the diagnosis of multifocal motor neuropathy (MMN) and multifocal acquired demyelinating sensory and motor (MADSAM) over motor neuron disease. About 30% to 50% of patients with these clinical syndromes or the pure motor variant of chronic inflammatory demyelinating polyneuropathy have ganglioside autoantibodies. High-antibody titers appear to be a specific, but not sensitive, marker of those related disorders.
Reporting Name
Ganglioside Ab Panel, SMethod Name
Enzyme-Linked Immunosorbent Assay (ELISA)
Method Description
Antiganglioside antibodies in serum are detected by enzyme-linked immunosorbent assays (ELISA). Ganglioside antigens (GM1, Asialo GM1, and GD1b) adsorbed to wells of ELISA plates are incubated with patient's serum or controls. The plates are washed and alkaline phosphatase conjugated antihuman IgG or IgM antibodies (ie, secondary) are added in a second incubation. The wash step is repeated and enzyme substrate is added. Absorbance is measured and results are expressed as antibody titer, ie, the greatest dilution at which the absorbance of wells that contain patient serum is greater than 2.0 times the mean absorbance of normal sera tested simultaneously.(Taylor BV, Gross L, Windebank AJ: The sensitivity and specificity of anti-GM1 antibody testing. Neurology 1996 October;47:951-955)
CPT Code Information
83516 x 6
83520 x 6 (if applicable)
LOINC Code Information
Test ID | Test Order Name | Order LOINC Value |
---|---|---|
GM1B | Ganglioside Ab Panel, S | 82455-7 |
Result ID | Test Result Name | Result LOINC Value |
---|---|---|
4414 | IgG Asialo. GM1 | 63212-5 |
4416 | IgG Disialo. GD1b | 94868-7 |
4412 | IgG Monos. GM1 | 63243-0 |
4415 | IgM Asialo. GM1 | 63384-2 |
4417 | IgM Disialo. GD1b | 94870-3 |
4413 | IgM Monos. GM1 | 63247-1 |
Report Available
5 to 8 daysTest Classification
This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. It has not been cleared or approved by the US Food and Drug Administration.Clinical Reference
1. Martinez JM, Snyder MR, Ettore M, et al: Composite ganglioside autoantibodies and immune treatment response in MMN and MADSAM. Muscle Nerve 2018;57:1000-1005 doi: 10.1002/mus.26051 2. Taylor BV, Gross L, Windebank AJ: The sensitivity and specificity of anti-GM1 antibody testing. Neurology 1996;47:951-9553. Kaida K, Ariga T, Yu RK: Antiganglioside antibodies and their pathophysiological effects on Guillain-Barre syndrome and related disorders-a review. Glycobiology 2009;19:676-692 doi: 10.1093/glycob/cwp027
Profile Information
Test ID | Reporting Name | Available Separately | Always Performed |
---|---|---|---|
IGG_M | IgG Monos. GM1 | No | Yes |
IGM_M | IgM Monos. GM1 | No | Yes |
IGG_A | IgG Asialo. GM1 | No | Yes |
IGM_A | IgM Asialo. GM1 | No | Yes |
IGG_D | IgG Disialo. GD1b | No | Yes |
IGM_D | IgM Disialo. GD1b | No | Yes |
Forms
If not ordering electronically, complete, print, and send a Neurology Specialty Testing Client Test Request (T732) with the specimen.
Reflex Tests
Test ID | Reporting Name | Available Separately | Always Performed |
---|---|---|---|
IGMTS | IgG Monos GM1 Titer, S | No | No |
IMMTS | IgM Monos GM1 Titer, S | No | No |
IGATS | IgG Asialo GM1 Titer, S | No | No |
IMATS | IgM Asialo GM1 Titer, S | No | No |
IGDTS | IgG Disialo GD1b Titer, S | No | No |
IMDTS | IgM Disialo GD1b Titer, S | No | No |