March 28, 2012 231 Comments
There are two important facts about the blood types of parents and their children that are not widely known. One of them caused an unexpected health problem in my family, and the other could have caused a much more serious problem but didn’t.
Please read the facts in red text, and click on the red links and read the information there, before asking questions in the comments. I am not a doctor or any kind of expert on blood types, just an ordinary person who wrote an article to publicize information that I felt was not clearly enough presented to the general population.
UPDATE: Since I posted this article, I’ve seen that many of the people who read it are looking for information about which blood types can have children together. Aside from rare mutations, a woman of any blood type and a man of any blood type can have a healthy baby together.
If the mother’s and father’s blood types are the same, this does NOT harm the baby.
In repeated Internet searches over three years, I have never found any report of any problem caused by parents having the same blood type–I have only seen people worrying about this possibility. There is no reason to worry! If you want to know what blood type your baby might have, or if you are wondering how your blood type can be different from your parent’s, look at these handy tables. Now, back to our story!
No, I’m not talking about Rh factor. The issue of “positive” vs. “negative” blood and how it affects pregnancy is well-known and mentioned in most books about pregnancy. Here is a typical article about Rh factor. Notice how it mentions antigens–the “letter” aspect of blood type, A, B, AB, or O–but then moves on, as if antigens aren’t important. What most people know about antigens is that they are important if you are receiving a blood transfusion. Putting blood with A antigens into your body, if your own blood does not have A antigens (Type A or AB), will cause an immune response that can kill you. The same is true for B antigens. If you are Type O, both A’s and B’s are dangerous, so you should not receive a transfusion of any type other than O. It is pretty quick and easy for medical professionals to determine a person’s blood type, so we don’t need to worry a whole lot about being given the wrong kind of blood, but just in case, it’s a good idea to know your blood type. These are the two things I didn’t know until after the point when it would have been medically useful to know them: Read more…