Preparation of<unk> cups for a lipids panel designed to test cholesterol levels in a patient's blood<unk> () is the fluid and solute component of blood which does not play a role in clotting. It may be defined as blood plasma without the clotting factors, or as blood with all cells and clotting factors removed.<unk> includes all proteins not used in blood clotting; all electrolytes, antibodies, antigens, hormones; and any exogenous substances (e.g., drugs or microorganisms).<unk> does not contain white blood cells (leukocytes), red blood cells (erythrocytes), platelets, or clotting factors. The study of<unk> is serology.<unk> is used in numerous diagnostic tests as well as blood typing. Measuring the concentration of various molecules can be useful for many applications, such as determining the therapeutic index of a drug candidate in a clinical trial. To obtain<unk>  a blood sample is allowed to clot (coagulation). The sample is then centrifuged to remove the clot and blood cells, and the resulting liquid supernatant is<unk>
Serum 
Blood
Blood plasma
Urine
Venous blood
Body fluid
Feces
Arterial blood