How is blood test normally done?
• The vein used for blood sampling is usually on the inside of your elbow or the back of your wrist.
• A tight band (tourniquet) 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 may be cleaned with an antiseptic wipe.
• A needle is then inserted into the vein through the clean skin, causing a sharp pricking sensation. The needle is connected either to a syringe, or directly to blood sample bottles.
• The tourniquet is undone. 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 sticking plaster may be put on. The blood is placed in bottles. There may be a slight ache following a blood test.