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Immunoglobulin G

IgG Serum IgG
Serum (SST) g/L

About this test

Most abundant serum immunoglobulin; provides long-term immunity. Divided into 4 subclasses (IgG1–4). IgG4 elevation in IgG4-related disease.

Reference Ranges

Sex Age Range Notes
All ≥ 18 yrs 7 – 16 Adult

Clinical Interpretation

Low / Decreased
Hypogammaglobulinaemia — CVID, CLL, immunosuppressive therapy, nephrotic syndrome.
High / Increased
Hyperimmunoglobulinaemia — chronic infection, autoimmune hepatitis, IgG myeloma, HIV.
Specimen
Serum (SST)
Reporting Unit
g/L
Category
🛡️ Immunology

⚠ Clinical Note
Reference ranges are indicative. Always interpret results in the context of the individual patient and local laboratory reference intervals, which may vary.