They use either whole blood to count blood cells, or they separate the blood cells from the fluid that contains them. Laboratory (lab) workers draw the blood and analyze it. Most people don't have serious reactions to having blood drawn. The procedure usually is quick and easy, although it may cause some short-term discomfort. It's usually drawn from a vein in your arm using a needle. Your doctor will let you know how to prepare for blood tests.ĭuring a blood test, a small sample of blood is taken from your body. For some, you may need to fast (not eat any food) for 8 to 12 hours before the test. Many blood tests don't require any special preparations. ![]() When you have routine checkups, your doctor may recommend blood tests to see how your body is working. Check whether medicines you're taking are workingīlood tests are very common.Find out whether you have risk factors for heart disease.Diagnose diseases and conditions such as cancer, HIV/AIDS, diabetes, anemia (uh-NEE-me-eh), and coronary heart disease.Evaluate how well organs-such as the kidneys, liver, thyroid, and heart-are working.Specifically, blood tests can help doctors: They also help check the function of your organs and show how well treatments are working. Blood tests help doctors check for certain diseases and conditions.
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