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Test Code BLOD0614 Immunoglobulin G (IgG), Plasma or Serum

Useful For

The detection of increased or decreased Immunoglobulin G values. IgG values are decreased in immune deficiency states, non-IgG myelomas and protein-losing conditions. IgG values are increased in chronic infections, liver disease, and myeloma.



Performing Laboratory

Bozeman Health Laboratory Services

Specimen Requirements

Specimen Type: Plasma or serum
Container/Tube: Light-green top (lithium heparin gel), 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: 600-1500 mg/dL


During childhood and adolescence, reference ranges for IgG are dependent on age and can vary over a wide range:


Age IgG mg/dL
0-4 months 141-930 mg/dL
4 months-8 months 250-1190 mg/dL
8 months-1 year 320-1250 mg/dL
1 year-3 years 400-1250 mg/dL
3 years-6 years 560-1307 mg/dL
6 years-9 years 598-1379 mg/dL
9 years-12 years 638-1453 mg/dL
12 years-15 years 680-1531 mg/dL
15 years-17 years 724-1611 mg/dL
≥ 17 years 600-1500 mg/dL


Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding