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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.
A platelet count is a test that is ordered in combination with a complete blood count, or CBC. A doctor may order this test when a patient has unexplained bruises or bleeds for long periods of time after they have been cut. An adult's normal platelet count ranges from 150,000 to 450,000 per microliter of blood.