If you're not sure what your Rh factor is and think you're pregnant, it's important to start regular prenatal care as soon as possible — including blood-type testing. Your Rh factor may play a role in your baby's health, so it's important to know this information early in your pregnancy.
Review Date: August 13, 2012
American Academy of Family Physicians
Be sure to have a blood-type test to determine your Rh factor when you become pregnant. This article explains why.
Review Date: February 22, 2012
The Nemours Foundation
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