The normal range of basophil percentage in normal adults is 0% to 1%, with 1.04 being slightly higher. Basophils belong to a kind of white blood cells, if elevated may be related to the test specimen error, hematological diseases, allergic diseases and so on. 1. Test error: sometimes there are specimen and operation errors in the test process, if it is high, it can be periodically reviewed for comparison. 2. Blood diseases: chronic granulocytic leukemia, myeloproliferative diseases, myelofibrosis, etc. are common. 3. Allergic diseases: such as allergic rhinitis, allergic asthma, contact with allergens (dust, animal hair) and so on. 4. Other: e.g. chicken pox, influenza, tuberculosis, diabetes, etc. If the percentage of basophils in the blood is found to be increased and accompanied by other symptoms, it is recommended to consult a doctor in time to clarify the cause, so as not to delay the condition.