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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.
1 The normal platelet count is 150,000-350,000 per microliter of blood, but since platelets are so small, they make up just a tiny fraction of the blood volume. 2  The principal function of platelets is to prevent bleeding.3  Red. 4  are the most numerous blood cell, about 5,000,000 per microliter.isorders of Platelet Number: Too Few Platelets. Disorders with low platelet counts are called thrombocytopenias, a term derived from an old name for platelets, âthrombocytesâ. This name describes the platelets as the cells (âcytesâ is a word for cell) that contribute to thrombosis, or blood clotting.