Platelets of 100×10^9/L are normal. This is because the number of platelets in the peripheral blood of a normal person is (100-300) × 10^9/L, which means that the number of platelets contained in each milliliter of blood is 100,000-300,000. Platelets 100×10^9/L is the number of platelets per milliliter of blood that contains 100,000, so it is normal. In clinical practice, it is abnormal if the platelet count is below 100×10^9/L or if the platelet count is greater than 300×10^9/L. However, if the platelet count is mildly reduced or mildly increased, there is often no significant effect on the body, but if the platelet count is severely reduced or significantly increased, both can cause serious harm to the body. When the platelet count is lower than 30×10^9/L, the patient will have obvious bleeding symptoms, manifested as bleeding spots and petechiae on the skin mucosa, or even nasal and gum bleeding, etc. If the platelet count is significantly higher, some patients will have a platelet count greater than 1000×10^9/L, they will be prone to thrombotic or embolic disorders.