Blood protein refers to many types of proteins found in the bloodstream, including albumin, fibrinogen, immunoglobulins, and transferrin. These proteins play crucial roles in maintaining the body's homeostasis and immunity. Blood proteins can be categorized based on their functions, structures, and molecular weights. They can also be identified using different synonyms such as serum protein, plasma protein, globulin, and alpha-2-macroglobulin. Each synonym refers to a specific type of blood protein with unique properties and functions. Knowing these synonyms can help researchers and medical professionals precisely identify and study these essential components of the blood.