SHEILA TERRY / SCIENCE PHOTO LIBRARY SHEILA TERRY / SCIENCE PHOTO LIBRARY
Blood sample being placed in a sample bottle ready for a blood count investigation. An anticoagulant is added to a known volume of blood and a count is made of the number of red cells, white cells and platelets present. This can be done by eye in a special counting chamber or, more accurately, using an electronic cell counter. Blood counts are important in the diagnosis of blood diseases. They are normally expressed as a number of cells, of a specific type, per litre.
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