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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 normal platelet count is 150,000-350,000 per microliter of blood, but since platelets are so small, they make up just a tiny fraction of the blood volume. 2  The principal function of platelets is to prevent bleeding.3  Red. 4  are the most numerous blood cell, about 5,000,000 per microliter.isorders of Platelet Number: Too Few Platelets. Disorders with low platelet counts are called thrombocytopenias, a term derived from an old name for platelets, âthrombocytesâ. This name describes the platelets as the cells (âcytesâ is a word for cell) that contribute to thrombosis, or blood clotting.