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A 24-year-old female asked:

why do you have to drink 32 oz of water before a pelvic ultrasound and hold it for an hour? that's four glasses of water!

1 doctor answer1 doctor weighed in
Dr. Gregory Fehr
Emergency Medicine 45 years experience
Ultrasound: Ultrasound will pass through liquid much better than air for better visualization. A full bladder gives better pictures.

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Why does medical saline use salt water instead of pure water?

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Matches body salt: Similar saline content as your blood.
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Last updated Feb 17, 2020

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