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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.
The number of platelets in the blood is referred to as the platelet count and is normally between 150,000 to 400,000 per micro liter (one millionth of a liter) of blood. Platelet counts less than 150,000 are termed thrombocytopenia. A platelet count greater than 400,000 is called thrombocytosis.ther disorders exist that can cause impaired platelet function despite normal platelet count. A low platelet count in severe cases may result in spontaneous bleeding or may cause delay in the normal process of clotting.