Discussions By Condition: Medical Stories

Weak D

Posted In: Medical Stories 5 Replies
  • Posted By: Sraointe
  • November 9, 2007
  • 07:22 PM

This is driving me crazy!
When I was pregnant I underwent 8 blood tests to type me because the Red Cross Had typed me as O- and then during my first blood test during the prenancy I came up at O+. It went back and forth until finally they just settled on positive.
They obviously do not do Weak D tests here and they are apparently becoming obsolete, and I'm not sure what to say my blood type is...do I say that I'm Weak D or O+?
Does anyone know?

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5 Replies:

  • Hi, it looks like you are indeed a weak D, but weak D-s should be classified as RhD negative. This is especially important for women in the child baring age, since receiving Rh+ blood can be fatal to the fetus. When donating blood though, you should be classified as O+, since Rh negative patients can react even to your suppressed D antigens.
    Anonymous 42789 Replies Flag this Response
  • I am Weak D. I am very confused. How did i get to be weak D. Am i normal? My daugter is A+ is that related to me being weak D? Is wead D blood group more common in the African population or whites?
    Anonymous 42789 Replies
    • September 18, 2009
    • 07:19 AM
    • 0
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  • I am Weak D. I am very confused. How did i get to be weak D. Am i normal? My daugter is A+ is that related to me being weak D? Is wead D blood group more common in the African population or whites?You're normal, just a little rare. Weak D is inheritable and can apply to any of the four groups A, B, AB, or O. I got my weak D from my father; my mother is O neg, my father is O weak, and I am O weak. You're daughter's type is partly inherited from you and partly from the other parent. She may be weak D from you, or a fully-expressed D (that is, positive) from the other parent. I don't know whether weak D can occur spontaneously (without being inherited).
    Anonymous 42789 Replies
    • October 19, 2009
    • 02:59 AM
    • 0
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  • I am Weak D. I am very confused. How did i get to be weak D. Am i normal? My daugter is A+ is that related to me being weak D? Is wead D blood group more common in the African population or whites?Hello. There are a couple of ways you could be weak D. You may have inherited a weak D (an incomplete or weakened expression of the D gene) directly from a parent who also had it. You also may have a full "D" gene, but due to another gene nearby it may not be expressed fully. While a weak D is not terribly common, neither is it terribly uncommon. It is more common among african americans than among caucasians. Your daughter may have inherited her D (positive) from you or her father (if he is a positive blood type). She may be a weak D herself, or she may have full expression. The reason it's important is that, as a weak D, you may develop antibodies to the D antigen just as someone who is Rh negative would. So, for instance, if you were pregnant with an Rh positive (D positive) child, you would probably need to receive a Rhogam shot to prevent the antibody formation that could hurt the baby.
    Anonymous 42789 Replies
    • November 21, 2009
    • 01:49 PM
    • 0
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  • Hi, it looks like you are indeed a weak D, but weak D-s should be classified as RhD negative. This is especially important for women in the child baring age, since receiving Rh+ blood can be fatal to the fetus. When donating blood though, you should be classified as O+, since Rh negative patients can react even to your suppressed D antigens.A weak D person is still Rh positive. An Rh neg person can only get neg blood, where as an Rh pos can get pos or neg blood. you are an O pos. It would be bad if you were typed as an O neg, but really had the weak D and they transfused your blood into a neg person.
    Anonymous 42789 Replies
    • February 11, 2011
    • 01:54 AM
    • 0
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