Why blood test?
Blood tests are very common. When you have routine checkups, your doctor may recommend blood tests to see how your body is working.
Many blood tests don’t require any special preparations. For some, you may need to fast (not eat any food) for 8 to 12 hours before the test. Doctors Immediate Care will let you know how to prepare for blood tests.
What happens during a blood test?
During a blood test, a small sample of blood is taken from your body. It’s usually drawn from a vein in your arm using a needle. A finger prick also might be used.
The procedure is quick and easy, although it may cause some short-term discomfort. Most people don’t have serious reactions to having blood drawn.
Laboratory (lab) workers draw the blood and analyze it. They use either whole blood to count blood cells, or they separate the blood cells from the fluid that contains them. This fluid is called plasma or serum.
The fluid is used to measure different substances in the blood. The results can help detect health problems in early stages, when treatments or lifestyle changes may work best.