Blood test

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 taken from a vein in the arm using a needle, or from a finger. Blood tests 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 illegal drugs.

Blood Test Media

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  Modern hospital hematology laboratory

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  Vacutainer tubes used in the collection of blood. During venipuncture, pressure differences between the vein and the vacuum in the Vacutainer forces blood into the tube.