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Positive A1 and B Cells on a Cord blood eluate

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The mom is O Neg with an Anti-D due to RhIG. The baby is B pos with a 3+ DAT. The physician orders an elution. The Anti-D shows up in the eluate and the A1 and B cells are both 3+ with the eluate. Are the reverse cells both positive simply because of the ABO incompatibility and how is this proven?

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Yes David.  You are correct that it could be maternal anti-A,B.


Yes also David.  The reverse typing cells in the UK are rr - although this can, on rare occasions, be a bit of a pain when the patient has an anti-c that reacts at RT.

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Agree with David and Malcolm about >A,B.   Run some more A1 and B cells (that are Rh neg) to rule in.   I am assuming you are getting negative reactions with group O Rh negative cells. 

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