The interval time for patients with chronic nephritis to have an ultrasound is related to the staging of the disease, and generally need to be examined once between 1 month and 6 months. 1. Early stage of the disease: In the early stage of chronic nephritis, because the disease is not too serious and the clinical symptoms caused by it are relatively mild, in this case, there is no need to undergo frequent renal ultrasound examination, and it is only necessary to check it once every 6 months or so. 2. Middle and late stage of the disease: in the middle and late stage of chronic nephritis, because the condition is more serious and the clinical symptoms induced are more serious, so it is necessary to receive frequent abdominal ultrasound examination, and it is generally recommended that the patient receives the examination once every 1 to 2 months. In addition, renal ultrasound has certain precautions, so it is recommended that patients have the need to consult a specialist before the examination, and actively cooperate with the doctor to do the relevant preparatory work.