A high macroplatelet ratio may cause bleeding-related symptoms, such as petechiae on the skin, bleeding gums, etc. It may also lead to blood clots, and in severe cases, it may even lead to internal bleeding or intracranial hemorrhage, which may be life-threatening. Under normal circumstances, the large platelet ratio is 8% to 16%. If the patient’s large platelet ratio is greater than 16%, it indicates that he or she may be suffering from certain hematologic diseases, such as primary thrombocytopenic purpura. A high large platelet ratio indicates an increase in the number of large platelets and a decrease in the number of normal platelets. This may lead to coagulation disorders, which may be manifested as bleeding tendency with symptoms such as skin petechiae and ecchymosis, bleeding gums, nasal bleeding, vomiting blood, black stools, and even serious life-threatening internal bleeding or intracranial bleeding. In addition, when the large platelet ratio is high, platelet agglutination is also likely to occur, which leads to the formation of blood clots, resulting in a higher chance of thrombotic diseases. If the test results indicate a high macroplatelet ratio, it is recommended to consult a doctor for professional treatment.