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What would be the reason for multiple blood-type results for one person? All taken from 2 hospitals (best hospitals in the state), doctor's offices, blood donations.

  1. Blood drawn after birth (written on a card by the labor nurse) states one blood-type.
  2. Blood drawn during pregnancy states a second different blood-type.
  3. Blood drawn during labor states a third different blood-type.

(Blood donation showed blood-type same as second listed blood-type)

All highly reputable places. All different blood-type results. How is this possible?

All results are RH Positive. One parent is universal donor, second parent's blood-type unknown.

ChameleonBlood
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  • Clearly, at least two people made a mistake, possibly all three. Without another typing, no one has any way of knowing which were the mistakes. Knowing one parent was type O only eliminates AB as a possibility. – Carey Gregory Feb 08 '22 at 00:13
  • I’m voting to close this question because it is unanswerable. – Carey Gregory Feb 08 '22 at 00:14
  • How would mistakes be made when determining blood types in the first place? – ChameleonBlood Feb 08 '22 at 02:31
  • Humans make mistakes. Most likely by someone simply transcribing lab results incorrectly or mixing up samples, and both can happen at several points in the process (collection, transport, lab, reporting results, copying results). But clearly at least two mistakes were made by different people at different times. – Carey Gregory Feb 08 '22 at 04:57
  • @CareyGregory I'd say your answer is the most likely, but I seem to very vaguely recall the possibility that with certain blood types, maternal blood can suppress features of the baby's blood or possibly the other way around. However, I can't find any evidence that this is actually so, or that it was at all related to the common ABO blood type. Could have been me mis-remembering rhesus factor problems in pregnancy. – bob1 Feb 08 '22 at 07:48
  • Related: https://biology.stackexchange.com/q/58562/27148 and https://biology.stackexchange.com/q/29975/27148 – Bryan Krause Feb 08 '22 at 15:01
  • There is also this https://medicalsciences.stackexchange.com/questions/4894/is-it-possible-to-change-persons-blood-group/4899#4899 – Carey Gregory Feb 08 '22 at 16:02

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