IgG

Immunoglobulin G (IgG) is a type of antibody, a protein produced by your immune system to identify and fight specific germs like bacteria and viruses. It plays a key role in protecting your body by recognizing invaders and helping to neutralize or mark them for destruction. IgG is the most common antibody found in your blood and extracellular fluid, providing long-term immunity after infections or vaccinations. Its presence indicates past exposure or ongoing immune response, making it important for immunity and diagnostic testing.