A vein is punctured in order to collect blood. It is typically carried out for laboratory testing. Most frequently, a vein on the inside of the elbow or the back of the hand is used to take blood. Antiseptic (medicine that kills germs) is used to clean the area. 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. A sharp instrument called a lancet may be used to pierce the skin and induce bleeding in newborns or young children. On a slide or test strip, the blood congeals. If there is any bleeding, the area may be covered with a bandage.
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