Overview
Rh incompatibility occurs when the mother's blood type is Rh negative and her fetus' blood type is Rh positive.
Review Date 3/6/2019
Updated by: Neil K. Kaneshiro, MD, MHA, Clinical Professor of Pediatrics, University of Washington School of Medicine, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.