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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.
1 The platelet count is the number of platelets in a person's sample of blood. 2  Mean platelet volume (MPV) may be reported with a CBC. It is a calculation of the average size of platelets.  Platelet distribution width (PDW) may also be reported with a CBC. It reflects how uniform platelets are in size.