Myelin Associated Glycoprotein (MAG) Antibody, with Reflex to MAG-SGPG and MAG, EIA

Test Code

CPT Codes

If MAG Antibody (IgM), WB is positive, then MAG-SGPG Antibody (IgM), EIA and MAG Antibody (IgM), EIA, will be performed at an additional charge (CPT code(s): 83520 x2)

Preferred Specimen
2 mL serum collected in a red-top tube (no gel)

Patient Preparation
Overnight fasting is preferred

Minimum Volume
1 mL

Avoid hemolysis

Transport Temperature
Refrigerated (cold packs)

Specimen Stability
Room temperature: 24 hours
Refrigerated: 7 days
Frozen: 30 days

Western Blot (WB)

FDA Status
This test was developed and its analytical performance characteristics have been determined by Quest Diagnostics. It has not been cleared or approved by the U.S. Food and Drug Administration. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.

Setup Schedule
Set up: Mon, Wed; Report available: 7-12 days

Reference Range
MAG Ab (IgM), WB Negative
  MAG-SGPG Ab (IgM), EIA ≤1:1600 titer
  MAG Ab (IgM), EIA <1:1600 titer

MAG Antibody (IgM), EIA  
  Normal <1:1600
  Moderately elevated 1:1600-1:3200
  Highly elevated ≥1:6400

Clinical Significance
MAG, Western Blot with reflexes is useful in detecting antibodies associated with autoimmune peripheral neuropathy.

Performing Laboratory
Quest Diagnostics Nichols Institute-San Juan Capistrano, CA
33608 Ortega Highway
San Juan Capistrano, CA 92675-2042

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.