Serum IgG test measures the amount of Immunoglobulin G (IgG) in the blood. IgG is the main antibody that helps the body fight infections and provides long-term immunity.

Risk Assessment:

• Helps evaluate immune system status

• Assists in diagnosing recurrent infections, autoimmune diseases, or immune deficiency

• Used to assess chronic infections or liver disease

• Helps monitor response to immunoglobulin therapy or vaccine immunity

Normal Range (may vary by lab):

• Adults: approx. 700 – 1600 mg/dL

Interpretation:

• High IgG levels:

  • Chronic infections

  • Autoimmune diseases (e.g., SLE, RA)

  • Chronic liver disease

  • Multiple myeloma (IgG type)

• Low IgG levels:

  • Primary or secondary immunodeficiency

  • Recurrent bacterial or viral infections

  • Nephrotic syndrome (loss of proteins in urine)

  • Long-term steroid therapy or chemotherapy

Sample Type:

• Blood sample (Serum)

• No fasting required