This usually isn’t a problem during your first pregnancy, since you typically won’t develop antibodies until after initial exposure to the positive blood type during delivery. Once your baby is delivered, exposure to their blood may cause your body to reject a positive blood type in the future.
If you are Rh-negative and your baby is Rh-positive, your body may develop Rh antibodies to the Rh-positive blood type after exposure. During a healthy pregnancy, your blood typically doesn’t mix with the baby’s blood until delivery. You can potentially have complications if your baby’s Rh-positive and you are Rh-negative. Incompatible blood types have problems when they mix. Why Healthcare Providers Test Rh Blood Type If your Rh blood factors are incompatible, this can pose a health risk to your baby. The only time it matters is when you’re Rh-negative and your baby is Rh-positive. It isn’t an illness and doesn’t affect your health. If you are Rh-negative, it doesn’t mean there’s a problem. Rh-positive is more common than Rh-negative. If it doesn’t have the protein, you’re Rh negative. If your blood has the protein, you’re considered Rh positive. It’s genetic, so it’s passed down by mother and father.
The Rh factor is a protein found on the surface of red blood cells. Your healthcare provider will want to know you and your baby’s Rh blood types to determine if you need special care. It’s important because even though your baby grows inside you, there’s a chance you and your baby have different blood types. You need to know whether your blood type is Rh-positive or Rh-negative. It’s a common screening usually done during the first prenatal visit. One of the first things your healthcare provider wants to test when you’re pregnant is your blood type and Rh blood factor.
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