![]() ![]() Coagulated blood (clotted blood) yields serum without fibrinogen, although some clotting factors remain. ![]() Anti-coagulated blood yields plasma containing fibrinogen and clotting factors. Serum is used in many medical diagnostic tests, as well as in blood typing.īlood is centrifuged to remove cellular components. Serum includes all proteins not used in blood clotting (coagulation) and all the electrolytes, antibodies, antigens, hormones, and any extra substances (such as drugs and microorganisms). It is the blood plasma without the fibrinogens. It does not contain white or red blood cells or a clotting factor. Serum is a clear, yellowish coloured fluid which is part of the blood.
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