Immunoglobulin G (IgG) — lab reference
In the reference guideAge and assay-specific. Consider subclasses or electrophoresis when indicated.
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What’s searchable?Age and assay-specific. Consider subclasses or electrophoresis when indicated.
Normal <140; prediabetes 140-199; diabetes ≥200.
Age and assay-specific. Important when interpreting IgA-based celiac testing.
Age and assay-specific.
Consider altitude and iron/B12/folate status. Pregnancy requires trimester-specific ranges.
Analyzer-specific; hemolysis and cold agglutinins may interfere.
Inflammation, hydration, liver synthesis, renal loss, and nutrition affect result.
Review albumin, globulin, and electrophoresis when indicated.
Often calculated. Consider SPEP/IFE for unexplained abnormalities.
Affected by thyroid-binding globulin, pregnancy, estrogen, and medications.
Morning fasting collection is preferred when practical. Day-to-day variation is substantial.
Interpret with iron, transferrin saturation, and ferritin.
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