The most common cause of thrombocytopenia is immune destruction, and in combination with leukopenia, bone marrow aspiration should be performed to exclude bone marrow lesions such as myelodysplastic syndrome. Finally, if the diagnosis of idiopathic thrombocytopenia is confirmed, tests should be done to see if there are chronic viral infections (hepatitis C virus, hepatitis B virus, HIV, etc.) and Helicobacter pylori infections, and if so, these infections need to be treated. After these processes, platelets above 30 (if there is no significant bleeding or infection) can be observed, and platelets below 30 can be considered for treatment.