IgD

Immunoglobulin D (IgD) is a type of antibody found in your immune system. It mainly resides on the surface of certain white blood cells called B cells, helping them recognize specific pathogens. IgD plays a role in activating B cells and guiding the immune response when your body encounters unfamiliar germs like bacteria or viruses. While it’s present in smaller amounts compared to other antibodies, IgD is important for the initial steps of immune defense and maintaining immune system balance. Its exact functions are still being studied, but it’s a key part of your body’s ability to detect and respond to infections.