Patients with only 30 units of platelets are classified as having a severely reduced platelet count. Patients often show signs of significant bleeding, manifested as bleeding spots and petechiae on the skin and mucous membranes, sometimes bleeding from the nose or gums, or internal bleeding such as vomiting blood, black stool, or blood in the urine. The survival period of patients with only 30 units of platelets is several years, which is closely related to the cause of thrombocytopenia and the patient’s own condition. If the platelet count is only 30 units and it is caused by immune thrombocytopenia, sometimes the patient can be cured after hormone therapy and treatment by removing the spleen, then the survival period is the same as normal people. However, if the platelets are 30 units and are caused by acute leukemia, the patient is more at risk at that time and if he/she is not sensitive to chemotherapy and has no chance to do allogeneic hematopoietic stem cell transplantation, the survival of the patient is often around 2-3 years. Therefore, the number of years a patient can live with only 30 units of platelets is closely related to the cause of thrombocytopenia and the patient’s own condition.