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Test ID FMGA Myelin Assoc. Glycoprotein (MAG) Antibody w/Reflex to MAG-SGPG & MAG, EIA

Method Name

Western Blot (WB)

Enzyme Immunoassay (EIA) (if appropriate)

Reporting Name

MAG w/Reflex MAG-SGPG and MAG, EIA

Specimen Type


Specimen Required

Specimen Type: Serum

Container/Tube: Red or SST

Specimen Volume: 2 mL

Collection Instructions: Draw blood in a plain red-top tube(s), serum gel tube(s) is acceptable. Spin down and send 2 mL of serum refrigerated in a plastic vial.

Specimen Minimum Volume

0.6 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Serum Refrigerated (preferred) 7 days
  Frozen  30 days
  Ambient  24 hours

Reference Values

MAG Ab (IgM), Western Blot


Reference Range: Negative




Reference Range:

      ≤ 1:1600





Reference ranges for MAG IgM Antibody:

   Normal:   <1:1600

   Moderately Elevated:  1:1600-1:3200

   Highly Elevated:  ≥1:6400


Day(s) and Time(s) Performed

Monday, Wednesday

Performing Laboratory

Quest Diagnostics Nichols Institute

CPT Code Information

84181 – Western blot with interpretation and report

83520 x 2 – Not otherwise specified (if appropriate)

LOINC Code Information

Test ID Test Order Name Order LOINC Value
FMGA MAG w/Reflex MAG-SGPG and MAG, EIA 31023-5


Result ID Test Result Name Result LOINC Value
Z2522 MAG Ab (IgM), Western Blot 31023-5

Test Classification

This test was developed and its performance characteristics have been determined by Quest Diagnostics Nichols Institute, San Juan Capistrano. It has not been cleared or approved by the U.S. Food and Drug Administration. The FDA has determined that such clearance or approval is not necessary. Performance characteristics refer to the analytical performance of the test.

Reflex Tests

Test ID Reporting Name Available Separately Always Performed

Testing Algorithm

If FMGA is Positive, then FMGS (MAG EIA Reflex) will be performed at an additional charge.

NY State Approved