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).he following lists some of the typical values of the components of the complete blood count: 1  WBC (white blood cell) count signifies the number of white blood cells in the blood and usually ranges between 4,300 and 10,800 cells per cubic millimeter (cmm).