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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.
The result is compared to a ânormalâ range, which represents the platelet count found in 95% of healthy individuals. In adults the platelet count is usually between 150 and 450 x 109/L, which means there are 150,000 to 450,000 platelets per microlitre of blood.A low platelet count (less than 150x19/L) may also be referred to as âthrombocytopeniaâ. Autoimmune disorders â such as lupus, can cause increased destruction of platelets. 2  Gestational thrombocytopenia â up to 1 in 10 women experience a fall in platelet count to below the normal range during pregnancy.