Basophils 1.2% is slightly on the high side. The normal range for basophils is 0 to 1%, with 1.2% being slightly on the high side. Common causes are as follows: 1. If only simple basophil 1.2%, other values are within the normal range, and there is no other physical discomfort, then you can not need to treat for the time being, pay attention to timely observation of the value of the changes can be. 2. Chronic allergic diseases: chronic allergic diseases such as allergic colitis or allergic rhinitis can lead to elevated basophils. 3. Bacterial infection: Local inflammation caused by bacterial infection can also cause elevated basophils. Elevated basophils may also be caused by other reasons, and should be promptly consulted by the doctor to identify the cause according to the comprehensive judgment of the examination indicators.