How is a blood test normally done?

· The vein used for blood sampling is usually on the inside of your elbow or back of your wrist.
· A tourniquet (tight band) is usually placed around your upper arm. This makes the vein fill with blood and makes it easier for the blood sample to be taken.
· The skin over the vein is usually cleaned with an antiseptic wipe.
· A needle is then inserted into the vein through the cleaned skin. The needle is connected either to a syringe, or directly to blood sample bottles.
· When the required amount of blood is taken, the needle is removed. The small wound is pressed on with cotton wool for a few minutes to stop the bleeding and prevent bruising. A sticky plaster may be put on. The blood is placed in bottles