I am blood type O-, my husband O+. When I gave birth to my son I was told he was type A+. Is that possible or they made a mistake?

Hi there - is possible as far as the rhesus (-/+) is concerned - look at this link - http://en.wikipedia.org/wiki/Blood_type OR http://www.drgreene.com/21_59.html
Its full of sciency stuff but read to the end! Hope that helps!
P.S - check out this site - has tables with possible offspring blood types in relation to the parents blood type - also none possible! http://www.craigmedical.com/blood_typing_facts.htm

SOMEONE has something wrong here. If you are both truly type O then your child must be type O. Some very rare things (like chimerism in you/your husband) could explain this, but it is almst unheard of. If you are certain that the child is his then my guess is someone mixed up a sample somewhere when the testing was done.

I think something is wrong with the test
Its wuite imposible
If any other complexes are involved then I don't know ,my knowledge is limited

Hi..,. it happened to me too... What did you find out later? Was it just a mistake? Please let me know cause my boyfriend acusing me for cheating on him

Yes, it is possible. I know this for fact because My 2nd child is A+ and my other 2 are O+. I KNOW who the father is as I was monogamous and my son was the only newborn with a beard and mustache at the hospital--so no mix up. This leaves 3 possibilities. 1. A mutation. 2. My late husband was a chimera, 3. I am a chimera. I have an appointment to be tested for micro-chimerism coming up soon as I have health problems that indicate this may be the case. Chimerism / micro-chimerism is caused by incomplete separation of a fraternal twin.

According to a geneticist my daughter asked about this, O is a mutation of A from long ago in our evolution and it is possible for there to be a backward mutation.