How much water should I drink to hold urine for a B-ultrasound?

To perform an ultrasound examination, it is necessary to drink 500-1000 milliliters of water to fill the bladder. This amount of water corresponds to the capacity of the bladder, allowing it to become fully distended. This can push aside the intestines, shifting the position of some organs upward, enabling the bladder to occupy a favorable position for clearer visualization of the uterus or other organs. Prior to the ultrasound, some water should be consumed, and urine retention is required, typically for a duration of approximately 15 minutes to one hour. The time required for urine retention may vary from person to person, and there is no specific clinical recommendation. Generally, the entire process from urine retention to the examination takes about one hour. If water has already been consumed prior to urine retention, the bladder will fill faster, resulting in a shorter examination time. There are also techniques for drinking water and retaining urine. It is recommended to sip water slowly to allow it to be absorbed by the small intestine as it reaches the intestines, rather than gulping large amounts of water that may pass through the colon and be expelled through feces. To facilitate faster urine retention, walking briskly while drinking water can aid in water absorption and digestion, enabling the bladder to fill with urine more quickly. The need to retain urine during an ultrasound examination is due to the fact that a distended bladder allows for a clearer understanding of the bladder wall and internal lesions, such as space-occupying lesions and stones. When the bladder is full, it can be clearly contrasted with the uterus, fallopian tubes, and ovaries, enabling timely detection of substantial lesions and improving the accuracy of the examination.