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Blood test

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A venipuncture performed using a vacutainer

A blood test , also known as bloodwork, is a laboratory analysis performed on a blood sample. The sample is usually extracted from a vein in the arm using a needle, or via fingerprick. Blood tests[1] are used to determine physiological and biochemical states, such as disease, mineral content, drug effectiveness, and organ function. They are also used to test for certain drugs.