PRP stands for platelet-rich plasma. Platelets are the components of your blood that are best known for blood clotting. Blood is made up of 55% plasma, 45% red blood cells, and about 1% white blood cells and platelets. Platelets also contain hundreds of proteins called growth factors, which are important in the healing of injuries. PRP is the separation of those platelets and plasma from the rest of the blood, which results in a high concentration of the platelets within the plasma, hence, platelet-rich plasma.