Eosinophil 13, which is a percentage of eosinophils of 13%, suggests a high value, and the normal range should be 0.5% to 5%. The causes of eosinophilia may include allergic diseases, parasitic diseases, blood diseases, etc., as follows: 1. Allergic diseases: bronchial asthma, urticaria, drug allergy, food allergy and other allergic diseases can cause eosinophilia, the value may be higher than 10%. 2. Parasitic diseases: Ascariasis, hookworm disease and other parasitic diseases may also cause eosinophilia, and the value may be higher than 10%. 3. Blood diseases: Blood diseases such as chronic myeloid leukemia can also cause eosinophilia. In addition, diseases such as tumors can also cause eosinophilia, and a single eosinophil value of 13% is not enough to determine the cause of eosinophilia. If you encounter this situation, you should promptly follow up the examination and submit the results to the doctor, who will make a comprehensive judgment based on the results of the examination and carry out targeted treatment.