Blood Test

testing of a sample of blood (usually to identify a disease or infection)

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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Blood test n. 1. An examination of a sample of blood to determine its chemical, physical, or serologic characteristics. 2. [more]Blood test - Community and Resources

Noun
1. a serologic analysis of a sample of blood
(hypernym) biopsy
(hyponym) agglutination test

Your healthcare provider can make a diagnosis by doing a blood test as well. Indeed, if you are extremely allergic and have severe anaphylactic reactions, your provider can’t use skin testing because causing an allergic reaction to the skin test could be dangerous. Skin testing also can’t be done if you have eczema over a large portion of your body.
Your healthcare provider may use blood tests such as the RAST (radioallergosorbent test) and newer ones such as the CAP-RAST. Another blood test is called ELISA (enzymelinked immunosorbent assay). These blood tests measure the presence of food-specific IgE in your blood. The CAP-RAST can measure how much IgE your blood has to a specific food. As with skin testing, positive tests do not necessarily mean you have a food allergy.