Bloodwork redirects here. For the 2002 film, see
Blood Work. For the 36 Crazyfists Song, see
Bloodwork (Song) Blood tests are
laboratory tests done on
blood to gain an appreciation of
disease states and the function of organs. Since blood flows throughout the body, acting as a medium for providing
oxygen and other nutrients, and drawing waste products back to the excretory systems for disposal, the state of the bloodstream affects, or is affected by, many medical conditions. For these reasons, blood tests are the most commonly performed
medical tests.
Blood is obtained from one of the patient's veins by
venipuncture or
fingerprick, except for tests such as
Arterial blood gas.
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