Questions: Practice 21. What is the normal blood platelet count? 22. What is the function of blood platelets? 23. What is the risk of high platelet count? What is the risk of low platelet count?

The normal blood platelet count is typically between 150,000 and 450,000 platelets per microliter of blood. This range can vary slightly depending on the laboratory and the specific methods used for measurement.

The function of blood platelets, also known as thrombocytes, is to aid in blood clotting. When a blood vessel is injured, platelets gather at the site of the injury, adhere to the vessel's lining, and work with other proteins to form a clot. This process helps stop bleeding and initiates the healing process.

The risk of a high platelet count, a condition known as thrombocytosis, includes an increased risk of forming abnormal blood clots (thrombosis), which can lead to complications such as stroke, heart attack, or deep vein thrombosis. Conversely, a low platelet count, known as thrombocytopenia, increases the risk of excessive bleeding and bruising, as the blood's ability to clot is impaired. This can lead to dangerous bleeding episodes, especially if the platelet count is significantly low.