A blood transfusion is a life-saving procedure where blood or blood products from a donor are given to a cat to treat a medical disorder. This may be whole blood (containing all four components of the blood) or blood components (plasma, platelets, etc.).
Blood is a part of the circulatory system which comprises of the blood, blood vessels, and the heart. It carries oxygen and nutrients around the body and removes waste products such as carbon dioxide. The average 5kg cat has about 325ml of blood.
Blood has four components; red blood cells, white blood cells, plasma, and platelets.