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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.
Platelet Count. Blood counts measure the amount of red blood cells, white blood cells, and platelets in the blood. A normal platelet count is between 150,000 to 450,000 platelets per micro-liter of blood. A low platelet count may result from a condition called thrombocytopenia.ike red blood cells and white blood cells, platelets are produced from bone marrow stem cells. Platelets are so named because unactivated platelets resemble miniature plates when viewed under a microscope.