A vein is punctured in order to collect blood. It is typically carried out for laboratory testing. Your pre-test preparation depends depend on the type of blood test you are undergoing. Many tests don't call for particular procedures. In some circumstances, your doctor will inform you whether you need to stop taking any medications or fast in order to have this test. Without first consulting your doctor, never stop taking your medications or change them. Anti-microbial cleaners are used to disinfect the area (antiseptic). To apply pressure to the area, an elastic band is wrapped around the upper arm. This causes a blood vessel below it to enlarge. The vein is punctured with a needle. The blood gathers into a tube or vial that is linked to the needle and is sealed. You take off the elastic band from your arm. After removing the needle, the area is bandaged to halt the bleeding.
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