IgG (immunoglobulin G) is the most abundant antibody in the blood and provides long-term protection against infections. It is the only antibody that can cross the placenta to protect a developing fet…
Category: Inflammation & Immune
Also known as: igg, immunoglobulin g, serum igg
Reference range: 700–1600 mg/dL (Source: ABIM)
Standard unit: mg/dL
High values may indicate
High IgG levels may indicate chronic infections, autoimmune disorders (such as lupus or rheumatoid arthritis), liver disease, IgG myeloma, or sarcoidosis.
Low values may indicate
Low IgG levels may indicate common variable immunodeficiency, primary immunodeficiency disorders, nephrotic syndrome, or conditions causing protein loss, and increase susceptibility to infections.