Blood tests

Blood cellsThese can be seen under a microscope and make up about 40% of the blood's volume. Blood cells are made in the bone marrow by blood 'stem' cells. Blood cells are divided into three main types:Red cells (erythrocytes)These make blood a red colour...

Article historyThe information on this page is written and peer reviewed by qualified clinicians. Next review due: 12 Feb 202813 Feb 2023 | Latest version...

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