Health A-Z

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You must fast on the day of the test. Digesting food causes your intestines to fill with extra air, which make the ultrasound image less sharp. Tell your doctor if you take insulin, because insulin can make your blood sugar drop after a period of fasting.

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From Health A-Z, Harvard Health Publications. Copyright 2007 by the President and Fellows of Harvard College. All rights reserved. Written permission is required to reproduce, in any manner, in whole or in part, the material contained herein. To make a reprint request, contact Harvard Health Publications. Used with permission of StayWell.

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