Methods to quickly hold urine for ultrasound include drinking large amounts of water for a short period of time, intravenous rehydration, or saline in the bladder. The specific need depends on the patient’s situation to decide. 1. Drink a lot of water in a short time: appropriate increase in the amount of water is conducive to the production of urine, especially drink more distilled water with lower osmotic pressure, the effect is better. 2. Intravenous rehydration: For those who cannot drink a lot of water for various reasons, under the condition of making sure that there is no obvious abnormality in cardiac function and renal function, they can increase the volume of urine by rapid intravenous infusion, so as to make the bladder fill up quickly. 3. Bladder injection: for patients with indwelling urinary catheter, injecting a certain amount of saline into the bladder and clamping the urinary catheter can ensure bladder filling, but need to pay attention to aseptic operation. In order to be able to see better, it is usually necessary to hold the urine quickly when performing gynecological and urological ultrasound to ensure that the bladder and ureter are full. You can ask your doctor for specific methods.