Praxis Medical Insights

Est. 2024 • Clinical Guidelines Distilled

Made possible by volunteer editors from the University of Calgary & University of Alberta

Last Updated: 9/19/2025

Management of Thrombocytosis in Children

Understanding Thrombocytosis in Children

  • Secondary thrombocytosis (platelet count >500 × 10^9/L) in children is common and benign; no antiplatelet therapy is necessary, as stated by the American Thoracic Society 1, 2, 3

Clinical Course and Management

Assessment

  • To determine if thrombocytosis is primary or secondary, a review of complete blood count and peripheral blood smear is necessary, according to the American Society of Hematology 4

Management Approach

  • No specific treatment is necessary for secondary thrombocytosis in children, as recommended by the American Thoracic Society 1, 2, 3
  • Despite high platelet counts, thromboembolic complications are extremely rare in children with secondary thrombocytosis, with studies showing no reports of thrombotic complications in over 1,000 children, as reported by the American Thoracic Society 1, 2
  • Platelet function remains normal in children with secondary thrombocytosis, as stated by the American Thoracic Society 1, 2

Follow-up

  • Consider hematology consultation if the patient becomes symptomatic, as suggested by the American Thoracic Society 3

Pitfalls to Avoid

  • Avoid unnecessary antiplatelet therapy, as it provides no benefit in secondary thrombocytosis, as recommended by the American Thoracic Society 1, 2