Sometimes more than one tube of blood is collected. The blood is collected in a tube and labelled with your name and other identifying information. You may feel a prick or stinging sensation. A needle is inserted into the vein and a small amount of blood is removed. You may be asked to make a fist so the veins stand out more. An elastic band (tourniquet) is wrapped around your upper arm to apply pressure to the area and make the veins easier to see. Check with the lab to see if you should avoid any medicines and for how long.īlood is usually taken from a vein in the arm. Some medicines may affect CBC results, so you may be asked to stop taking certain medicines before a CBC. You may be given special instructions to follow before having a CBC done. A CBC is usually done in a community lab or hospital.
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