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A platelet count is a diagnostic test that determines the number of platelets in the patient's blood. Platelets, which are also called thrombocytes, are small disk-shaped blood cells produced in the bone marrow and involved in the process of blood clotting.ypersplenism is characterized by the collection (sequestration) of platelets in the spleen. Disseminated intravascular coagulation (DIC) is a condition in which blood clots occur within blood vessels in a number of tissues. All of these diseases produce reduced platelet counts.
Defining Mean Platelet Volume. Mean platelet volume is an average measure of the total number of platelets in the blood. Its value is calculated using specific laboratory equipment. Mean platelet volume is calculated from a regular blood sample obtained from patients vein. It is a parameter that can be calculated along with complete blood count i.e. CBC. The sample is run through a specific machine that calculates the platelet volume based on the values derived from a platelet histogram.