Blood serum is the liquid part of blood that remains after blood cells are removed. It's important because it contains proteins, nutrients, and other substances that can be measured or analyzed to help diagnose diseases and monitor health.
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Preparation of serum cups for a lipids panel designed to test cholesterol levels in a patient's blood
Serum (/ˈsɪərəm/) is the fluid and solvent 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. Serum contains all proteins except clotting factors (involved in blood clotting), including all electrolytes, antibodies, antigens, hormones; and any exogenous substances (e.g., drugs, microorganisms). Serum also does not contain all the formed elements of blood, which include blood cells, white blood cells (leukocytes, lymphocytes), red blood cells (erythrocytes), and platelets.
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