Platelets (also called thrombocytes) are small blood cell fragments made by your bone marrow. They help form blood clots to stop you from bleeding when you've been injured. Platelets are small cell ...

A typical platelet count range can change with age. Platelet counts may fluctuate due to natural vascular aging, changes in bone marrow tissue, and altered blood plasma makeup. Platelets, or ...

A high platelet count, or thrombocytosis, is diagnosed when platelet levels are greater than 450,000 platelets per microliter of blood. A high platelet count can lead to symptoms that range from ...

Because leukemia is a blood cancer, it can affect a person’s platelet count. People with leukemia sometimes have a low platelet count. However, other conditions can also cause low platelets. Leukemia ...