A platelet count is a lab test to measure how many platelets you have in your blood. Platelets are parts of the blood that helps the blood clot. They are smaller than red or white blood cells.
The number of platelets in your blood can be affected by many diseases. Platelets may be counted to monitor or diagnose diseases, or to look for the cause of too much bleeding or clotting.
The normal number of platelets in the blood is 150,000 to 400,000 platelets per microliter (mcL) or 150 to 400 × 109/L.
