Generally, adult humans have anywhere between 20 trillion and 30 trillion red blood cells at any given moment. Men typically have higher red blood cell counts than women. Living at high altitudes tends to increase red blood cell counts in both sexes. A man will typically have around five million cells per microliter of blood while women have around four million. In comparison, there are fewer than 11 thousand white blood cells and 400 thousand platelets per microliter. Red blood cells account for 45 percent of the cells in the blood.
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