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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 White blood cell (WBC) count is a count of the total number of white blood cells in a person's sample of blood. 2  White blood cell differential may or may not be included as part of the panel of tests. 3  It identifies and counts the number of the various types of white blood cells present. Evaluation of platelets, cell fragments that are vital for normal blood clotting: 2  The platelet count is the number of platelets in a person's sample of blood. 3  Mean platelet volume (MPV) may be reported with a CBC. 4  It is a calculation of the average size of platelets.