Complement is a blood test that measures the activity of certain proteins in the liquid portion of your blood. The complement system is a group of nearly 60 proteins that are in blood plasma or on the surface of some cells.
Answer: Blood is made up of liquids and solids. The liquid part, named plasma, is made of water, salts, and protein. About half of your blood is plasma. On the other hand, the solid part of your blood contains red blood cells, white blood cells, and platelets.
