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HelpTest Code LAB8847 Myelin-Associated Glycoprotein Autoantibodies, IgM, Serum
Additional Codes
MAGES
MAG
Specimen 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.
Forms
If not ordering electronically, complete, print, and send a Neurology Specialty Testing Client Test Request (T732) with the specimen.
Secondary ID
607034Useful For
Evaluating peripheral neuropathy
Evaluating paraproteinemic neuropathy
Method Name
Enzyme-Linked Immunosorbent Assay (ELISA)Specimen Type
SerumSpecimen 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 |
On-campus collections: Tube to 99 or deliver to University Extension Hospital Room EH318
Send in plastic vial, Refrigerated
Off-campus collections:
Centrifuge and aliquot within 2 hours.
Specimen to be stored/transported
Reject Due To
| Gross hemolysis | Reject |
| Gross lipemia | Reject |
| Gross icterus | Reject |
Reference Values
<1500 Buhlmann Titer Unit
Interpretation
A positive result is consistent with anti-myelin-associated glycoprotein neuropathy.
Method Description
Microwells are precoated with human myelin-associated glycoprotein (MAG) antigen. The calibrators, controls, and diluted patient samples are added to the wells, and autoantibodies recognizing the MAG antigen bind during the first incubation. After washing the wells to remove all unbound proteins, purified horseradish peroxidase-labeled anti-human IgM conjugate is added. The conjugate binds to the captured human autoantibody, and the excess unbound conjugate is removed by a further wash step. The bound conjugate is visualized with 3,3',5,5'-tetramethylbenzidine substrate, which gives a blue reaction product, the intensity of which is proportional to a concentration of autoantibody in the sample. Acid is added to each well to stop the reaction. This produces a yellow end-point color, which is read at 450 nm.(Package insert: anti-MAG Autoantibodies ELISA. Buhlmann Laboratories AG; 10/2018)
Day(s) Performed
Tuesday, FridayReport Available
2 to 6 daysSpecimen Retention Time
28 daysPerforming Laboratory
Mayo Clinic Laboratories in Rochester
CPT Code Information
83520
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| MAGES | MAG IgM, S | 39087-2 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| 607034 | MAG IgM, S | 39087-2 |