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1 Platelet count measures the number of platelets in a volume of blood and usually ranges between 150,000 to 400,000 per cmm. 2  Mean platelet volume (MPV) measures the average size of platelets in a volume of blood.3  The normal range is between 6 to 12 femtoliters (a very small fraction of a liter). RBC (red blood cell) count measures the number of red blood cells in a volume of blood and usually ranges between 4.2 to 5.9 million cells per cmm.
When your blood has too few platelets, mild to serious bleeding can occur. Bleeding can occur inside your body (internal bleeding) or underneath your skin or from the surface of your skin (external bleeding). A normal platelet count in adults ranges from 150,000 to 450,000 platelets per microliter of blood.A platelet count of less than 150,000 platelets per microliter is lower than normal. If your blood platelet count falls below normal, you have thrombocytopenia.However, the risk for serious bleeding doesn't occur until the count becomes very lowâless than 10,000 or 20,000 platelets per microliter.Mild bleeding sometimes occurs when the count is less than 50,000 platelets per microliter.hen your blood has too few platelets, mild to serious bleeding can occur. Bleeding can occur inside your body (internal bleeding) or underneath your skin or from the surface of your skin (external bleeding). A normal platelet count in adults ranges from 150,000 to 450,000 platelets per microliter of blood.