thrombocytosis

/ˌθrɑmbəsaɪˈtoʊsɪs/
noun
  1. A medical condition in which the blood has a higher than normal number of platelets, which can increase the risk of blood clots.
    • The doctor monitored her thrombocytosis closely after surgery.
    • Patients with thrombocytosis may need medication to prevent clotting.
    • Thrombocytosis is often discovered during a routine blood test.