Platelets 109 x 10^9/L are normal. Normal platelet count is (100-300) x 10^9/L, and 109 x 10^9/L is within the normal range, so it is normal. The main function of platelets is to stop bleeding. When the organism is injured, platelets quickly adhere to the trauma and aggregate into clusters to form a looser hemostatic plug. The platelet count of a normal person is (100~300) x 10^9/L, while the platelet count of a patient is 109 x 10^9/L is within the normal range. Only when the platelet count is greater than 400×10^9/L or less than 100×10^9/L, it is abnormal and can be suspected as thrombocytosis or thrombocytopenia. Thrombocytosis is likely to lead to recurrent bleeding and thrombosis, while thrombocytopenia is likely to lead to bleeding in multiple organs. Please be guided by your physician to determine the specific indicators.