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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