Can I have RHNeg if I am O+

Hi
My OB has ordered some blood tests to check for RH Neg. I am O+, I didn't think I could have RH Neg with a positive blood group. Am I wrong here? This is my 4th pregnancy. I have two children and have had one miscarriage.
My first 2 children had severe jaundice and the OB at the time said he suspected there may be a blood group incompatibility. How is this possible if I am o+? My husband does not know his blood type and we don't know our children's blood types either. It's a bit confusing and I am wondering why he is ordering the tests if It is not possible for me to be RHneg.
Thanks
LisaB.

hmmm I dunno, Im o+ also & DH o- its never been brought up with me.

Doesn't make much sense, maybe they should be testing your DH?? I would get some clarification on why he is ordering the tests for sure. Perhaps he thinks that you are mistaken..

Doesn't make any sense to me. If you know you are definatly O+ then you can't be Neg.

If your a + in any group you are fine. There is no reason for further testing. I would be asking ur doc why he wants this done.

Your baby could be rhesus neg but the only problem is is you are rhesus neg, not the bub. Rhesus neg is recessive, non of my parents, brothers or sister are neg.

My husband and I are both RH Neg blood types, so when I was pregnant I didn't have anti D. However, I am a weak RH. Somehow I got a positive baby. Apparently we each carry 2 genes and that is how I came to have a positive baby. I was once typed as positive when I gave blood, but I was typed several times after that as I was confused. Each time I was Neg. So it can happen, rare though. :dunno:

Hi
Thanks for the responses. I have been tested for blood type every time I have been pregnant and on several other occassions, and it has always been 0+. This OB even tested me early in my pregnancy, maybe he was just busy when he filled out the pathology request and that's what he usually tests for.
I'm due to see him again before I have the tests so I'll ask about it. I was just confused about the whole thing.
Thanks
LisaB.

I would ask for clarification - if your are rhesus + you don't have anything to worry about.

Your doctor is probably just being thorough as blood group testing is a test that is generally ordered with the initial pregannacy blood tests.

And you are right you cant be O+ and carry the rhesus negative factor. The positive means that you do carry the rhesus factor so there shouldnt be any danger.

It may not neccessarily be for rhesus. There are lots of different blood group incompatabilities that can cause severe jaundice in newborns. Kell, duffy, and anti-C are just are few. Incompatability with these is rare and not as severe and rhesus but they still do happen. Bub can be the same blood group as you ie a+ and still be affected by these. Ask if your other babies had a positive direct coombs test if he thinks it is a blood incompatability. Is it specifically rhesus he is looking for or a general antibody screen? I wouldn't worry sometimes severe newborn jaundice runs in families as isn't related to anything. Hope this is helpful.

Hi all
Thankyou for your replies, they have been very helpful. I will have a further look into some of the other reasons for blood group incompatibility.
Kind Regards
Lisa B.