If you just found out you're pregnant, one of the first - and most important - tests you should expect is a blood
-type test. This basic test determines your blood
type and Rh
factor. Your Rh factor may play a role in your baby's health, so it's important to know this information early in your pregnancy.
What Is the Rh Factor?
People with different blood types have proteins specific to that blood type on the surfaces of their red blood cells. There are four blood types - A, B, AB, and O.