All blood cells are made in the bone marrow, the centre of large bones. Some medications or diseases can damage the bone marrow, which in turn can reduce the numbers of different types of red or white blood cells.

The Haematology Profile blood test provides important information about the type, number and appearance of cells in the blood, especially red blood cells (vital for carrying oxygen around the body), white blood cells (key to the body's immune system), and clotting cells (important for controlling and stopping bleeding).