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Hemostasis, the process that stops bleeding after a blood vessel injury, is crucial for maintaining the integrity of the circulatory system. However, disorders of hemostasis can disrupt this delicate balance, leading to either excessive clotting or bleeding. These disorders can be broadly classified into thromboembolic disorders and bleeding disorders.
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Related Experiment Video

Updated: May 27, 2026

Megakaryocyte Differentiation and Platelet Formation from Human Cord Blood-derived CD34+ Cells
09:46

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Published on: December 27, 2017

Thrombocytosis in children.

P Chiarello1, M Magnolia, M Rubino

  • 1Department of Internal Medicine and Surgery, Magna Graecia University, Catanzaro, Italy.

Minerva Pediatrica
|November 15, 2011
PubMed
Summary

Thrombocytosis, an elevated platelet count, is rare in children but common as reactive thrombocytosis (RT). RT is often mild and requires monitoring, while primary thrombocytosis is a rare myeloproliferative disorder.

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Area of Science:

  • Pediatric Hematology
  • Oncology
  • Internal Medicine

Background:

  • Normal pediatric platelet counts range from 250,000 to 450,000/μL.
  • Thrombocytosis is defined as a platelet count greater than 2 standard deviations above normal.
  • Clinical classifications include mild, moderate, severe, and extreme thrombocytosis based on platelet levels.

Purpose of the Study:

  • To differentiate between primary and secondary thrombocytosis in pediatric patients.
  • To outline the incidence, causes, and clinical significance of thrombocytosis in children.
  • To provide guidance on when to consult a pediatric hematologist.

Main Methods:

  • Review of existing literature on pediatric thrombocytosis.
  • Classification of thrombocytosis into primary (familial, essential) and secondary (reactive) types.
  • Analysis of incidence rates, common causes, and severity in pediatric populations.

Main Results:

  • Primary thrombocytosis is a rare myeloproliferative disorder in children (1 in a million), often associated with high platelet counts (>1,000,000/μL) and potential thrombotic/hemorrhagic events.
  • Secondary or reactive thrombocytosis (RT) is common (3-13% of hospitalized children), typically triggered by infection, inflammation, iron deficiency, or tissue damage.
  • The majority of pediatric thrombocytosis cases are mild (72-86%), with extreme elevations rare (0.5-3%).

Conclusions:

  • Reactive thrombocytosis is the predominant form in children and usually benign.
  • Primary thrombocytosis, though rare, is a serious myeloproliferative condition requiring specialized care.
  • Persistent, unexplained, or symptomatic thrombocytosis in children warrants pediatric hematologist consultation; otherwise, close monitoring is often sufficient.