Normally, Your doctor will administer at least one dose of RhoGAM Ultra-Filtered PLUS Injection between 26 and 28 weeks of pregnancy because it will last for about 12 weeks. If the newborn is RH positive, the mother will receive another dose of RhoGam within 72 hours after delivery.

The Rh factor is a protein that can be found on the surface of red blood cells. If your blood cells have this protein, you are Rh positive. If your blood cells do not have this protein, you are Rh negative.