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 ...

Thrombocytopenia occurs when there aren’t enough platelets, which are tiny blood cells that help with clotting. In some cases, thrombocytopenia is the first sign of acute HIV infection. Severe ...