IgG (Immunoglobulin G)

This test measures the level of immunoglobulin G (IgG) in the blood, the most abundant antibody class in the body and a cornerstone of long-term immune defence. It is used to assess humoral immune function, helping to investigate recurrent or unusual infections, monitor known immune deficiencies, and support the evaluation of autoimmune and inflammatory conditions. It is suitable for adults and children where immune status is in question, and for those with a family history of immune disorders or unexplained persistent infections.

What is included
- Immunoglobulin G (IgG): the principal antibody produced during a secondary immune response, providing lasting protection against bacteria, viruses, and other pathogens. Measuring IgG helps identify whether the immune system is producing adequate antibodies or whether levels are abnormally low or high.

Why it matters
IgG levels give a direct window into your immune system's readiness and memory. Low levels can point to an immune deficiency that leaves you vulnerable to repeated infections, while elevated levels may accompany chronic inflammation, autoimmune conditions, or persistent antigen exposure. Knowing your IgG status helps your doctor decide whether further immune investigation, vaccination review, or specialist referral is needed, and provides a baseline for monitoring over time.