IgM

IgM is a type of antibody, a protein produced by your immune system to help fight infections. It is usually the first antibody made when your body encounters a new pathogen, like a virus or bacteria. IgM helps to quickly neutralize these invaders and activates other parts of the immune system. Since it appears early during infection, doctors often measure IgM levels to determine if someone is currently fighting an infection. Afterward, other antibodies like IgG take over for ongoing immunity. Overall, IgM plays a crucial role in your body's initial response to infections.