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How do patients prepare for an ultrasound?

Written by : DoctorNDTV Team

The preparation required for an ultrasound is minimal. If internal organs such as the gallbladder are to be examined, patients are asked to avoid eating and drinking for six to eight hours prior to the examination. This is because food causes gallbladder contraction, minimizing the size which would be visible during an ultrasound. In case of an examination of the lower abdomen or during pregnancy it is recommended to have four to six glasses of water one to two hours prior to examination for the purpose of filling the urinary bladder. The extra fluid in the bladder is easy to identify and moves air-filled bowel loops away from the womb so that the baby and womb are more easily seen during the test.

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