These are cells of the immune system that fight infection. white blood cells – known collectively as leukocytes.Haemoglobin contains iron, which is important for carrying oxygen around the body Every red blood cell contains haemoglobin, a protein that carries oxygen. red blood cells – known as erythrocytes.Blood cells make up the other 40 per cent and include: The main component (60 per cent) is the liquid called plasma, which is made up of water, fat, protein, sugar and salts. This means a person who weighs 70 kg has approximately 5 to 5.5 litres of blood.īlood has four main components. You may have minor bruising at the injection site for a day or two.Īpproximately seven to eight per cent of your body weight is blood. They will cover the injection site with an adhesive dressing. Once the blood sample has been taken, the person taking the sample will ask you to press gauze or cotton wool against the injection site to minimise bleeding.You may experience some discomfort during the procedure, but this is usually minimal. The doctor, nurse or technician inserts a needle into your vein and draws the blood, which is collected inside a syringe or vial.The injection site is wiped with an alcohol preparation to clean the site and reduce the risk of infection.The doctor, nurse or technician may ask you to clench and unclench your fist to help swell your veins with blood. A tourniquet is put around your arm and tightened to increase blood volume in your veins.At the surgery, you are asked to sit or lie down.The procedure normally includes the following: In most cases, no special preparation is needed before the test. If an abnormality is found, your doctor will usually arrange further tests to find the cause of the abnormality. The FBC test looks for abnormalities in your blood, such as unusually high or low numbers of blood cells. The sample is sent to a laboratory and put into a machine for analysis. The blood sample is collected inside a special vial that contains a chemical to prevent the blood from clotting. The doctor, nurse or technician takes a blood sample from you using a needle inserted into a vein in your hand or the crook of your elbow. The full blood count (FBC) is a common test that can help to diagnose a wide range of illnesses, infections and diseases.
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