Serum includes all proteins not used in blood clotting ( coagulation ) and all the electrolytes , antibodies , antigens , hormones , and any exogenous substances ( e.g. , drugs and microorganisms ) .
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 ) .