![]() During a Complete Blood Count (CBC) test, one or more tubes of blood are typically collected from your vein. Each tube is labeled with your name and other identifying information. You may feel a slight pinch or stinging sensation as the needle is inserted into your vein to collect a small amount of blood. To make the veins more visible, you might be asked to make a fist. An elastic band (tourniquet) will then be wrapped around your upper arm to apply gentle pressure and help the healthcare professional locate the vein. Before the test, it's recommended that you check with the lab to see if there are any medications you should avoid taking and for how long beforehand. Typically, blood is collected from a vein in the arm. Some medications might affect CBC results, so you may be asked to stop taking certain drugs before the test. You will likely receive specific instructions to follow before having a CBC done. The test itself usually takes place at a community lab or hospital.
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