Rh immunoglobulin injection

An Rh immunoglobulin shot is given during pregnancy to prevent Rh sensitization. Rh sensitization can happen if you have Rh-negative blood and your baby has Rh-positive blood. If the two types of blood mix, your body will make antibodies against your baby's blood. Most of the time, this is not a problem the first time you're pregnant. But it could cause problems in future pregnancies.

This shot keeps your body from making the antibodies. If you need the shot, it is given around 28 weeks of pregnancy. After the birth, your baby's blood is tested. If the blood is Rh positive, you will receive another shot. The shot may also be given if you have vaginal bleeding while you are pregnant or if you have a miscarriage. These shots protect future pregnancies.