Help with blood types

[Kae]

Can two negatives make a positive?

[GraceAmazing]

Not sure about that, but are you worried about the Rh factor?

[Rachel]

What exactly are you wondering about blood types?

[Kae]

What exactly are you wondering about blood types?

I am O- and my husband is A-. Can this combination make a A+ baby?
With my first two children we were in the military and they would give you the rhogram if you were negative no matter what your husbands blood type was. The reason for this is because they didn't know who the father was and assumed you didn't either. I have had a midwife with the rest and didn't worry about it. I was told that two negatives can't make a positive. With my 7th child I ended up with a c-section in the hospital and they told me I needed the rhogram because the baby was A+. I questioned a little and they said two negatives could make a positive. I was drugged and out of it and my husband was driving in from out of town. I forgot about and it hasn't been a concern until this pregnancy. They are saying that it isn't possible to make a positive with two negatives. Just looking to see if anybody has more knowledge on this. The doctor's have been taught that it isn't possible and make it sound like it isn't something they are not really sure on.

[GraceAmazing]

I am negative and so is my husband and we have two beautiful girls. One has positive blood and the newest one is negative. So that being said, I received rhogam for both pregnancies...including during and after. Why couldn't you just ask for the shot to be on the safe side??? The rhogam is also for the next pregnancy. That's what my OB/GYN explained to me.

[rgcraig]

I found this online:

http://www.drgreene.com/21_1003.html

There is a chart there that shows possible blood types and impossible blood types of the children.

[HeavenlyOne]

For those of you with positive children who's parents are both negative, I suggest you get another blood test.

Most individuals have two blood type markers on their cells. Of the ABO blood types, you have a dominant gene and a recessive gene. It's the same with the Rh factor. In positive people, they could have a negative recessive gene and if they have a baby with someone who is positive and negative, the baby could be negative even though both parents are positive. Follow?

Mom is +- and dad is +-. This means there is a 25% chance they will have a baby with -- markers.

It's impossible for it to be the other way around because to be negative, you have to have both genetic markers negative, one from each parent you have. Since positive markers always dominate negative markers, if you are negative, you have only negative markers.

If mom is -- and dad is --, there is only one possibility in all children.

Therefore, if both parents are Rh negative then the children will be Rh negative.

I did find this little tidbit while looking around, however.

Some individuals have red blood cells which are Del, meaning they have a very low level of D antigen (the molecule on the surface of red blood cells that makes them Rh-positive) which is generally not detectable by Rh factor testing, but can induce anti-D antibodies in a true Rh-negative individual. If the baby's father was Del, he would type as Rh-negative but in fact be Rh-positive (with much much lower levels of the antigen than most Rh-positive individuals), and the baby could also be Del which would potentially still result in the usual complications with an Rh- mother carrying an Rh+ child.

However, this doesn't make a positive blood type because, just as in the father, the Rh positive markers would be undetectable.

[HeavenlyOne]

References:

http://ask.metafilter.com/76686/An-O-positive-offspring-of-two-O-negative-parents

http://www.drgreene.com/21_59.html

http://se.babycenter.com/pregnancy/complications/wrongcombinationbloodexpert/

That last site has a lot of good info.

[Pragmatist]

There is a lot that science doesn't know yet, so I would never say never. I just recently learned that two people with O could produce an A baby, the A antigen is recessive.

[Kae]

Thanks for the help. Those links answered my question. I am actually going to get the baby retested this afternoon. If he is still positive then we will have to get my husband tested. My husband was in the military and they are the ones that labeled him A-. I have a hard time believing they made a mistake. He was in for too many years for them not to have caught it.

[Kae]

There is a lot that science doesn't know yet, so I would never say never. I just recently learned that two people with O could produce an A baby, the A antigen is recessive.

If the baby is positive and my husband is negative then it is possible, because is is impossible that my husband isn't the father.

[HeavenlyOne]

There is a lot that science doesn't know yet, so I would never say never. I just recently learned that two people with O could produce an A baby, the A antigen is recessive.

Not possible. O's cannot produce ABO antigens. O is recessive because it has no antigens, so if someone has an AO marker, their blood type is A. You can only be O with OO markers. If both parents have OO markers, the only result are OO babies. A antigens are not recessive. It's impossible to have OA markers or OB markers. The O is always recessive unless you get one from each parent, then it's dominant in the receiving individual.

If you are referring to people who have O markers but not O type blood, then you are correct. That's because they have the O recessive markers that most people have. The only people who don't have O markers are AB type folks. They cannot produce O babies because they don't have O markers.

http://www.canadiancrc.com/Paternity_determination_blood_type.aspx

That site tells you the possibilities. It's not possible for O parents to have any other children but O. But like I said before, if they have O markers with a different blood type, then yes, it's possible, and you will see that possibility on that website also.

[SavedLou]

i'm relieved to hear about two of ya'll with the rh factor also. the doc told me not to worry about it b/c of the shot i will take, but it was still in the back of my mind. kae, my doc told me that a neg mom and pos dad could produce either a pos or neg baby but a neg mom and neg dad would produce a neg baby, which i guess would do away with the need for the shot. i'd rather be safe and take it anyway, even if my hubby was neg. i'm not sure what he is.

[HeavenlyOne]

i'm relieved to hear about two of ya'll with the rh factor also. the doc told me not to worry about it b/c of the shot i will take, but it was still in the back of my mind. kae, my doc told me that a neg mom and pos dad could produce either a pos or neg baby but a neg mom and neg dad would produce a neg baby, which i guess would do away with the need for the shot. i'd rather be safe and take it anyway, even if my hubby was neg. i'm not sure what he is.

They give the shot anyway because there are people who will say the dad is one person when in fact it's someone else. They can't take the chance that you aren't being honest about parentage, so it's safer to just give the shot instead of interrogating the mom.

[Kae]

i'm relieved to hear about two of ya'll with the rh factor also. the doc told me not to worry about it b/c of the shot i will take, but it was still in the back of my mind. kae, my doc told me that a neg mom and pos dad could produce either a pos or neg baby but a neg mom and neg dad would produce a neg baby, which i guess would do away with the need for the shot. i'd rather be safe and take it anyway, even if my hubby was neg. i'm not sure what he is.

I had the shot with the first 2 and after that I didn't get again until my 7th after he was born, because he has A+ blood type, according to the hospital.

I'm just the opposite and do not want any chemicals or medicines unless the are absolutely necessary.

[Pragmatist]

Not possible. O's cannot produce ABO antigens. O is recessive because it has no antigens, so if someone has an AO marker, their blood type is A. You can only be O with OO markers. If both parents have OO markers, the only result are OO babies. A antigens are not recessive. It's impossible to have OA markers or OB markers. The O is always recessive unless you get one from each parent, then it's dominant in the receiving individual.

If you are referring to people who have O markers but not O type blood, then you are correct. That's because they have the O recessive markers that most people have. The only people who don't have O markers are AB type folks. They cannot produce O babies because they don't have O markers.

http://www.canadiancrc.com/Paternity_determination_blood_type.aspx

That site tells you the possibilities. It's not possible for O parents to have any other children but O. But like I said before, if they have O markers with a different blood type, then yes, it's possible, and you will see that possibility on that website also.

My doctor was wrong then; she said my daughter had the possibility of A blood, though my husband and I are both O. I hate it when you know more than your doctor. :boxing

[HeavenlyOne]

I had the shot with the first 2 and after that I didn't get again until my 7th after he was born, because he has A+ blood type, according to the hospital.

I'm just the opposite and do not want any chemicals or medicines unless the are absolutely necessary.

If it's important, I would have him retested. If it's not important, I wouldn't worry about it. ;)

Aren't you due soon?

[HeavenlyOne]

My doctor was wrong then; she said my daughter had the possibility of A blood, though my husband and I are both O. I hate it when you know more than your doctor. :boxing

Doctors can be wrong. Nurses can be wrong. I can be wrong.

But I'm not.....LOL!

I looked at several sites about it, trying to find out additional information but they all said the same thing. It's impossible according to 'the experts' I read for two O parents to have an A baby.

But hey, maybe one of you were tested wrong, I don't know.

A friend of mine is A+. Her husband and father of both children is B+. Her son is O+.

Her husband's mother accused her of having an affair, because she claimed her son was AB-. My friend, knowing he was the father, got a test on her husband.

His mother was wrong. Thankfully! LOL!

[Kae]

If it's important, I would have him retested. If it's not important, I wouldn't worry about it. ;)

Aren't you due soon?

My doctor insists I have the shot unless I have proof my husband is A-. I don't want it if I don't need it. I did get them to get me the one without mercury in it if I do have to have it.

I am due Aug 7.

[HeavenlyOne]

My doctor insists I have the shot unless I have proof my husband is A-. I don't want it if I don't need it. I did get them to get me the one without mercury in it if I do have to have it.

I am due Aug 7.

I think it's better to be safe than sorry as well.

I'm excited for you, even though you've been through it so many times already. A girl in my nursing class had her 9th baby in March. Large families are rare anymore, but I think it's great for those who can care for them.

I'm done, being too old and having two teens. No starting over for me at this point...LOL!

[commonsense]

I always find blood types interesting.
I do not know what my mothers blood type was. But, I am O neg, my sister is O pos and my brother is A neg; we do know that my dad was O pos and it would appear that my mother was A neg. I know her sister lost a couple babies due to the RH factor but in early 1940's there was no solution.

[Kae]

My son's blood type is A positive. I just got the test results back. So I need to get the rogram. Now I want to get my husband tested to see what his blood type really is.