Learn about the Platelet Count Test, its purpose, uses, normal values, test results interpretation, and more for a better understanding of your health. A normal platelet count is between 150,000 to 450,000 per microliter of blood. A high platelet count over 450,000 can lead to blood clots, while a low count below 150,000 increases bleeding risk. The general range for adult platelets has been 150,000–450,000 pla telets/mcL of blood. However, a 2022 review suggests platelet counts could change significantly based on a person’s age and... Understand platelet count variations – from low to normal to high ranges in humans. Explore the implications of platelet levels on overall health. Gain insights into the causes and potential consequences of low or high platelet counts.