Human immunoglobulin G

Human immunoglobulin G (IgG) is the most common type of antibody in the blood, playing a critical role in the immune system. It helps identify and neutralize bacteria, viruses, and other harmful substances, preventing infections. IgG is produced by immune cells in response to these threats and can also provide long-term immunity after an infection or vaccination. It circulates throughout the bloodstream and tissues, acting as a key defender by recognizing specific invaders and facilitating their removal. IgG levels can be measured to assess immune function and diagnose various immune-related conditions.