Why Should Drink Water Before Ultrasound?

The first time I had my first pregnancy, I had an ultrasound appointment at 26 weeks but was not asked to drink water. Now I'm pregnant with my second baby at 20 weeks, but my new doctor said, I have to drink lots of water and not eat anything after 9pm the day before. Could you please explain why this is so?
Reply
In general, early ultrasound (before 20-24 weeks or earlier) requires a full bladder because the doctor may use a transducer ultrasound (the transducer placed on your abdomen).
The reason for this is that the water in the bladder creates a "window" for the ultrasonic waves to pass through (it also provides a good environment for conducting sound).
In addition, a stretched bladder can change the position of the uterus, causing the uterus to be pushed up and easier to scan. A tight uterus also makes the pelvic organs easier to see through ultrasound because it is not obstructed by the intestines.
During the subsequent ultrasound, an ultrasound to the vagina is in place and the bladder is full of water at this time unnecessary.
The enlarged uterus is located above the pubic bone and the fluid in the amniotic sac is easily observed through the ultrasound beam

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Why Should Drink Water Before Ultrasound?

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