Medical Encyclopedia:
Intravenous Urography: Preparation
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Emptying the bowel with laxatives or enemas prevents bowel shadows from obscuring the details of the urinary system. An empty stomach prevents the complications of vomiting, a rare effect of the contrast agent. Therefore, the night before the IVP the patient will be asked to evacuate the bowels and to drink sparingly.
— J. Ricker Polsdorfer, MD
