A health care provider takes a sample of your blood, urine, other body fluid, or body tissue during a laboratory (lab) test to obtain information about your health. A lot of the time, lab tests is used to help diagnose or check for a particular disease or condition. Diseases can be diagnosed earlier, before symptoms appear. To keep an eye on a disease or determine whether treatment is working, other tests are used. In order to get a more comprehensive picture of your organs and systems, laboratory tests may also be performed.
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