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A unit of blood is equivalent to approximately 1 pint or 450 milliliters, according to the Canadian Blood Services website. The average patient requires around 4.6 units of blood.
The cellular components of blood include erythrocytes (red blood cells), leukocytes (white blood cells), and platelets. Normal human blood contains 4.8 - 5.2 million erythrocytes/ml and 4000 - 10,000 leukocytes/ml. Leukocytes are divided into five classes based on morphological and tinctorial characteristics when stained.