Use of Ultrasonography to Identify Infants for Whom Urinary Catheterization Will Be Unsuccessful Because of Insufficient Urine Volume: Validation of the Urinary Bladder Index

A urinary bladder index less than 2.4 cm2 appears to identify infants for whom urinary catheterization will be unsuccessful because of insufficient urine volume. Ultrasonographic evaluation with urinary bladder index measurement before catheterization may eliminate the incidence of failed procedures.