Platelet 36 is usually defined as a platelet count of 36 x 10⁹/L, which is low platelet count and suggestive of a number of diseases such as aplastic anemia, acute leukemia, primary immune thrombocytopenia, and disseminated intravascular coagulation. 1. Aplastic anemia, i.e., aplastic anemia, is a disease of bone marrow hematopoietic failure caused by a variety of etiological factors, usually with a reduction of the three blood systems (red blood cells, white blood cells and platelets), which can be clinically manifested as anemia, bleeding of the skin and mucous membranes, and fever. 2. Acute leukemia is a kind of malignant disease originated from hematopoietic stem cells, because acute leukemia will lead to a decrease in the number of platelets of the body, which will lead to bleeding of the skin and mucous membranes, and there will be pale skin and mucous membranes as well as fever and other clinical symptoms. 3. Primary immune thrombocytopenia, due to the abnormal immune function will lead to the patient’s body platelet index decrease. 4. Disseminated intravascular coagulation can also lead to a decrease in platelet count. If low platelet count is found during physical examination, it is recommended to go to the hematology department as soon as possible for a clear diagnosis and standardized treatment under the guidance of the doctor.