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Other Names for Thrombocythemia and Thrombocytosis

Primary thrombocythemia also is called:

  • Essential thrombocythemia. This term is used when a high platelet count occurs alone (that is, without other blood cell disorders).
  • Idiopathic (id-ee-o-PATH-ick) thrombocythemia.
  • Primary or essential thrombocytosis (these are less favored terms).

Thrombocytosis also is known as:

  • Secondary or reactive thrombocytosis.
  • Secondary thrombocythemia (this is a less favored term).
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Thrombocythemia and Thrombocytosis Clinical Trials

Clinical trials are research studies that explore whether a medical strategy, treatment, or device is safe and effective for humans. To find clinical trials that are currently underway for Thrombocythemia and Thrombocytosis, visit

July 31, 2012 Last Updated Icon

The NHLBI updates Health Topics articles on a biennial cycle based on a thorough review of research findings and new literature. The articles also are updated as needed if important new research is published. The date on each Health Topics article reflects when the content was originally posted or last revised.