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The page below is a sample from the LabCE course Authentic and Spurious Causes of Thrombocytopenia. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Acute Idiopathic Thrombocytopenia

Acute ITP occurs most often in children who are between 1 and 7 years of age subsequent to a viral infection such as measles, rubella, Epstein-Barr, chicken pox or cytomegalovirus (CMV). The platelet count may drop below 20 x 109/L and the patient may experience excessive bruising, nose bleeds, and petechiae, typically with a rapid onset.
Spontaneous remission usually occurs within 2 - 6 weeks of onset of acute ITP so that treatment is often not needed unless the platelet count drops below 10 x 109/L, a level at which there is a high risk of bleeding into the central nervous system.
The usual course of action is to try to prevent trauma that could result in bleeding and then periodically check the platelet count until it returns to normal.