Perinatal outcomes in singleton pregnancies with a single umbilical artery.

Objective: To analyze perinatal outcomes in singleton pregnancies with a single umbilical artery (SUA) as an isolated finding with no other underlying disorders.

Methods: This retrospective observational study compared a group of pregnancies with SUA (n = 127) and a group with a normal 3-vessel umbilical cord (n = 27 752). The study variables comprised maternal and obstetric characteristics and perinatal outcomes.