Abstract
Platelet counts below and above the normal range, thrombocytopenia and thrombocytosis, respectively, are encountered frequently in clinical practice. Because both thrombocytopenia and thrombocytosis can be associated with bleeding and with arterial and venous thrombosis, they engender substantial and appropriate concern by treating physicians. However, the number of circulating platelets in normal individuals is far in excess of the number required for normal hemostasis, and thrombocytosis due to concurrent illness is not generally associated with hemostatic abnormalities. Thus, understanding normal platelet physiology and pathophysiology is essential so that patients at risk are appropriately evaluated and treated, while patients who are not are spared unnecessary expense and worry. The nature of this problem is illustrated by patients admitted to intensive care units. Approximately 30–50 % of patients in intensive units become thrombocytopenic at some point during their intensive care unit stay (Crowther et al. 2005). Thrombocytopenia in this setting has been associated with increased bleeding, increased transfusion of blood products, longer intensive care unit stays, and increased intensive care unit and hospital mortality. Nonetheless, workups to identify specific and treatable causes for the thrombocytopenia, while often extensive, are usually futile.
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Huntington, S.F., O’Hara, M.H., Bennett, J.S. (2016). Platelet Disorders: Diagnostic Tests and Their Interpretations. In: Abutalib, S., Connors, J., Ragni, M. (eds) Nonmalignant Hematology. Springer, Cham. https://doi.org/10.1007/978-3-319-30352-9_16
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