Low platelet distribution width means that the volume of platelets in the blood is more consistent and homogeneous in size, and the distribution width is low, which is not clinically significant, and the clinical concern is more about the number and function of platelets. The number of platelets, if excessive, can induce thrombotic and embolic events to occur. If platelets gather together, they tend to form platelet thrombi, and platelets forming thrombi tend to release various substances that cause red blood cells and white blood cells to combine together to form red blood clots. Patients with thrombocytosis are prone to thrombosis, as well as embolic diseases. Platelets have a hemostatic function, and if there are too few platelets, the body is prone to bleeding and does not clot easily, as in the case of bleeding from brushing teeth, bleeding from coughing, bleeding from scratches, and not stopping bleeding easily. With normal platelet count, if platelet function is low, the same obstacle to hemostasis will occur and bleeding will be easy. If platelet function is enhanced, events such as thrombosis and embolism are likely to occur. When you receive a laboratory test, you should focus on the number of platelets, but you can also measure platelet function through other tests.