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Test Code BLOD0615 Immunoglobulin M (IgM), Plasma or Serum

Useful For

The detection of increased or decreased Immunoglobulin M values.  IgM values are decreased in immune deficiency states, non-IgM myelomas, and protein-losing conditions. IgM values are increased in chronic infections, liver disease, cirrhosis, and Waldenströdm’s macroglobulinemia.



Performing Laboratory

Bozeman Health Laboratory Services

Specimen Requirements

Specimen Type: Plasma or serum
Container/Tube: Light-green top (lithium heparin gel), dark-green top (sodium heparin), red top, or gold top
Specimen Volume: 1 mL
Specimen Minimum Volume: 0.5 mL

Collection Instructions:

1. Label specimen as plasma or serum.

2. Avoid hemolysis and lipemia.

Specimen Transport Temperature


Specimen Stability


Specimen Type Temperature Time
Plasma or Serum Refrigerated 7 days
  Frozen 3 months


Additional Information

If specimen must be frozen for stability, freeze within 24 hours of draw.

Reference Values

Adults: 50-300 mg/dL


During childhood and adolescence, reference ranges for IgM are dependent on age and gender:


Age   IgM mg/dL
0-4 months   14-142 mg/dL
4 months-8 months   24-167 mg/dL
8 months-1 year Male 35-200 mg/dL
  Female 34-242 mg/dL
1 year-3 years Male 41-200 mg/dL
  Female 41-242 mg/dL
3 years-17 years Male 47-200 mg/dL
  Female 56-242 mg/dL
≥ 17 years   50-300 mg/dL


Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding