Usually, it is not necessary to hold urine for renal ultrasound examination, and you can consult the attending doctor in detail before the examination. Renal ultrasound is a common imaging means of examination, clinical renal ultrasound can observe the location and size of the kidneys, but also to diagnose kidney stones, hydronephrosis and determine renal mobility, etc. Usually, you do not need to hold your urine during renal ultrasound examination. However, if you need to check the ureter, bladder, etc., you need to drink a lot of water and hold your urine. Renal ultrasound is a non-invasive test, and generally does not cause adverse effects on the health of the organism, so the test taker should adjust their mindset and actively cooperate with the doctor to take the appropriate position for the test, without excessive worry. When kidney ultrasound examination is abnormal, patients should further do other tests, and combined with medical history and other comprehensive diagnosis of the disease. It is recommended to consult regular hospitals for kidney ultrasound examination to ensure the accuracy of the examination results. In order to ensure the health of kidneys, patients should drink more water and urinate more frequently, and also strengthen personal hygiene care.