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How do you fast for an abdominal ultrasound?

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Quick Answer

A patient is supposed to fast for 8 to 12 hours ahead of an abdominal ultrasound, according to Mayo Clinic. The fast includes complete avoidance of any food and liquids. It is sometimes permissible to drink water, but a patient should discuss this with a doctor in advance.

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Full Answer

The primary goal of an ultrasound on the abdomen is to get a clear picture of the aorta. Having food or liquids in the stomach or urine in the bladder can impede the technician's view, according to Mayo Clinic. A patient on medications should talk to a doctor about whether these are allowed while fasting.

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