Mother is O negative, baby is A negative. The DAT on the baby is positive, so the Weak D is inconclusive.
According to the limitations of the FMH screen, if you have a weak d (which we don't know if it is or isn't because of the positive DAT) you must use a test to detect feto-maternal hemorrhage other than the screen. We send out a KB for this determination. However, the limitations also state that "in cases of ABO incompatibility between mother and child, the mother's natural ABO antibodies may destroy any fetal cells in the maternal blood specimen before testing is performed. This is true for any method of detecting fetal cells in the maternal blood."
So my question is would you send this ABO incompatible specimen out for a KB or would you just issue the mother one vial of Rhogam and not worry about the KB since nothing may be detected? This was an uncomplicated vaginal delivery.