Disease or Syndrome
thrombocytosis
Subclass of:
Myeloproliferative disease; Blood Platelet Disorders
Also called:
Essential Thrombocythemia; Primary Thrombocythemia
Definitions related to thrombocytosis:
  • A hematology test result that indicates the presence of higher than normal platelet counts in the peripheral blood.
    NCI
    U.S. National Cancer Institute, 2021
  • Abnormally high level of platelets in the blood.
    NICHD Pediatric Terminology
    U.S. National Cancer Institute, 2021
  • Increased number of platelets in the peripheral blood.
    CRISP Thesaurus
    National Institutes of Health, 2006
  • Increased numbers of platelets in the peripheral blood. (Dorland, 27th ed)
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
  • Platelets are blood particles produced in the bone marrow that play an important role in the process of forming blood clots. Thrombocytosis (throm-boe-sie-TOE-sis) is a disorder in which your body produces too many platelets.
    Mayo Clinic
    Mayo Foundation for Medical Education and Research, 2025
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