Blood serum. Laboratory technician holding a sample tube containing blood serum. Blood serum is the clear liquid that separates from blood when it is allowed to clot. The fibrinogen usually found in blood is absent, as it has been converted to fibrin during the clotting process and remains behind in the clot. Blood serum is used to evaluate renal function, coronary risk factors, diabetic control and nutritional state. It is also used to diagnose diabetes, and kidney and liver disease.
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