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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.
Applications. Typically, the mean platelet volume ranges between 7.2 to 11.7 fL. This is roughly equivalent to tiny spheres that range in size from 2.65 to 2.8 micrometer in diameter. Any value of the mean platelet volume outside this range is indicative of an underlying clinical process. Platelets whose mean platelet volume is above the normal range are called macro-thrombocytes while those below the normal range are micro-thrombocytes. The table below lists the different conditions where mean platelet volume may vary.