Which of the following describes a high platelet count?

A high platelet count is referred to as thrombocytosis. This condition occurs when the body produces an excessive number of platelets, which can happen in various situations such as after surgery, during infections, or as part of certain diseases like myeloproliferative disorders. Thrombocytosis can be classified into primary and secondary types; primary thrombocytosis typically involves a bone marrow disorder, while secondary thrombocytosis can occur due to various physiological responses.

Thrombocytopenia, on the other hand, refers to a low platelet count, which can lead to increased risk of bleeding. Leukopenia is a term for a low white blood cell count, whereas leukocytosis indicates an elevated white blood cell count. Both leukopenia and leukocytosis pertain to white blood cells and are thus unrelated to platelet counts. This distinction clarifies why thrombocytosis is the appropriate term for a high platelet count.