Overview
Rh incompatibility occurs when the mother's blood type is Rh negative and her fetus' blood type is Rh positive.
Review Date 5/14/2024
Updated by: John D. Jacobson, MD, Professor Emeritus, Department of Obstetrics and Gynecology, Loma Linda University School of Medicine, Loma Linda, CA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.