Center for Surrogate Parenting

Surrogates and Blood Type

Exploring surrogates and blood type

As any parent can tell you, understanding the biological side of pregnancy takes time, research and multiple discussions with a medical professional. Even then, for every question answered, there is another question that pops up during those nine months. For parents using surrogacy, there may be even more questions, including questions about surrogates and blood type.

DNA and the surrogate

A surrogate is carrying a baby with someone else’s DNA, not her own. She does not contribute genetic material to the creation of the embryo. There is a possibility that a tiny bit of the surrogate’s DNA will transfer during gestation, but it is such a tiny amount that it has no significance.

A baby’s DNA comes from his or her biological parents. Half comes from the mother, and half from the father. As a result, you shouldn’t have to worry too much about surrogates and blood type.

Blood type and choosing an egg donor

If you need an egg donor, should you be concerned about blood type?

There are three blood types: A, B, and O. Some types are rarer than others. When choosing an egg donor, you replace the intended mother’s biology with the egg donor’s. Many parents often choose a donor based upon physical characteristics, such as hair and eye color, height, ethnicity, educational background and personality.

There is little potential risk of medical conditions if the surrogate and your child have different blood types. The antibodies to the ABO blood types are large and unable to cross the placenta between the surrogate and the baby.

RH factor

CSP surrogates go through an intensive health screening and a battery of tests before being approved for our program. A blood draw determines each surrogate’s Rh factor, which is either Rh positive or Rh negative. Rh positive means she has the Rh factor, an antigen carried by red blood cells. Rh negative means she does not.

Your baby can inherit the Rh factor from its biological father or mother. About 85% of the Caucasian population is Rh positive. The number for Asians, African-Americans, and Native Americans is even higher. That leaves between 10% to 15% of people who are Rh negative.

If an Rh negative woman is carrying an Rh positive baby, the baby’s blood cells can enter her circulatory system. Her immune system may see this as a foreign substance and attack the baby. This could cause the baby to develop a type of anemia called rhesus disease.

If a surrogate is Rh negative, and the biological parents are positive, the surrogate will receive a shot of RhoGAM at 28 and 34 weeks, and again after the birth. The RhoGAM vaccination prevents sensitization to the Rh factor, which protects the baby.

Get answers about surrogates and blood type

Surrogacy requires intended parents and the surrogate to share intimate and private information regarding medical history, psychological health, financial information, and more. Medical and personal screenings, including those related to blood type and Rh factor, are essential for successful surrogacy and a healthy new baby.

Your CSP case manager will be happy to answer all of your questions about surrogates and blood type, so that you can have peace of mind that your baby will be safe and protected, right up to the day you get to meet him or her for the very first time.