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ABO set up


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Hi

I took care of a baby who's mother is B+ and baby is A+ with a DAST/Coombs+. The DAT was sent inarventently  since we only sent DAT in mother's with blood tupe O or rh negative. I was surprised to see this results since I have always understand that ABO incompatibility  that cause significant hemolysis is only produced when mother is O and baby is A or B group. The reason for this ABO incompatibility set is not too clear. I understand its because when mama is O and baby is A or B; IgG antibodies casn be produced during gestation that will cross the placentas . Unlike when mama is A and baby is B or mama is B and baby is A only igM antibodies are produce yhjat will not cross the placenta. I am not sure why this is  produced this way??

Any input or insights will be apreciated

 

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