Globulin is a group of proteins found in the blood plasma that play various roles in the body. These proteins are essential for immune function, transporting nutrients, and maintaining blood pressure. Globulins are classified into different types, including alpha, beta, and gamma globulins, each serving specific functions. Gamma globulins, for example, are crucial for the immune system as they include antibodies that help fight infections. The levels of globulin in the blood can be measured through a blood test, which can provide insights into a person's health and help diagnose conditions such as liver disease or immune disorders.