Print By Mayo Clinic Staff Request an appointment About July 29, 2022 Print Show references Frequently asked questions. The Rh factor: How it can affect your pregnancy. American College of Obstetricians and Gynecologists. Accessed July 5, 2022. Moise KJ. RhD alloimmunization in pregnancy: Overview. https://www.uptodate.com/contents/search. Accessed July 5, 2022. Moise KJ. RhD alloimmunization: Prevention in pregnant and postpartum patients. https://www.uptodate.com/contents/search. Accessed July 5, 2022. American College of Obstetricians and Gynecologists. Practice Bulletin No. 192: Management of alloimmunization during pregnancy. Obstetrics & Gynecology. 2018; doi: 10.1097/AOG.0000000000002528. Reaffirmed 2019. American College of Obstetricians and Gynecologists. Practice Bulletin No. 181: Prevention of Rh D alloimmunization. Obstetrics & Gynecology. 2017; doi: 10.1097/AOG.0000000000002232. Reaffirmed 2021. Related Products & Services A Book: Mayo Clinic Family Health Book A Book: Mayo Clinic Guide to a Healthy Pregnancy Newsletter: Mayo Clinic Health Letter — Digital Edition Show more products and services from Mayo Clinic Rh factor blood testAbout PRC-20394950 Patient Care & Health Information Tests & Procedures Rh factor blood test