A high platelet count indicates too many of the small cells (platelets) that help form blood clots. This can cause dangerous clots and bleeding. Also called thrombocytosis or thrombocythemia ...

Nelson, MDMedically reviewed by Douglas A. Nelson, MD Thrombocytosis, or a high platelet count, is diagnosed when platelet levels are greater than 450,000 platelets per microliter of blood.

However, when OPCs were sustainedly exposed to platelets, this effect was suppressed. Finally, a sustained increase in the number of circulating platelets (thrombocytosis) led to a persistent ...