Prenatal Anteroposterior Pelvic Diameter Cutoffs for Postnatal Referral for Isolated Pyelectasis and Hydronephrosis: More is Not Always Better

Using these thresholds, we could avoid a significant number of followup ultrasounds in the prenatal and postnatal periods, as well as invasive postnatal tests (ie voiding cystourethrography and mercaptoacetyltriglycine scintigraphy) without missing even a single case of obstructive nephropathy requiring surgery.