Increased numbers of platelets in the peripheral blood.
Comment:
Thrombocythemia and thrombocytosis are conditions with a higher than normal number of platelets. The term "thrombocythemia" is preferred when the cause of a high platelet count isn't known. The condition sometimes is called primary or essential thrombocythemia.
Synonyms:
exact_synonym:
Increased number of platelets in blood; Increased platelet count