Platelets are the tiny blood cells that help stop bleeding by binding together to form a clump or plug at sites of injury inside blood
A normal platelet count
is between 150,000 and 450,000 platelets per microliter (one-millionth of a liter, abbreviated mcL). The average platelet count is 237,000 per mcL in men and 266,000 per mcL in women.
A platelet count below 150,000 per mcL is called thrombocytopenia, while a platelet count over 450,000 is called thrombocytosis.