Platelet 13 is abnormal and belongs to a serious decrease in the number of platelets, because platelet 13 means the number of platelets contained in each milliliter of blood is 13,000, while the number of platelets contained in each milliliter of blood in normal people is 100,000-300,000, so platelet 13,000 belongs to a serious decrease in the number of platelets, and the patient will show obvious symptoms of bleeding, mainly manifested as bleeding spots on the skin mucosa, Petechiae, and also nasal and gum bleeding may occur, as well as internal bleeding such as vomiting blood, black stool, and blood in urine. For patients with 13,000 platelets, attention should be paid to bed rest, reducing activities, avoiding trauma causing thrombocytopenia, and also actively identifying the cause and giving corresponding treatment. If the platelets are 13,000 due to immune thrombocytopenia, then glucocorticoid therapy is necessary. Prednisone acetate and dexamethasone can be taken, and recombinant human thrombopoietin can also be used in combination. In general, the patient’s platelet count may increase significantly within a week or so. There are also malignant diseases of the blood system that may cause thrombocytopenia, and it is important to seek prompt medical attention to avoid delays.