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NBME 22 Answers

nbme22/Block 1/Question#16 (30.3 difficulty score)
An Rh-negative woman, gravida 3, para 2, has ...
O, Rh-negative🔍

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 +10  upvote downvote
submitted by usmleuser007(326),
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troheM is -egRhn -&tg-; esh will atnreeeg eadRHst)1iibo- n sfteu afefctde yb iA-Rnth fi ti is ht -2e)psioRvi evne fi Otvie-R-Pihos si ,igenv nhte iltsl reosh'mt eaiR-sodhitnb iwll atcatk ndsfutaers obdlo edu ot sit sllce nntgicaoni R+)h3 etroe,ferh Ri-eheOvga-tn is tsbe

makinallkindzofgainz  you're not wrong, but I think it's better to have put O-negative because that's the preferred type of RBC for transfusion unless you've type and crossed your patient +  
mtkilimanjaro  I think fetus is O+ but if you give them that the RBCs will still be destroyed. You want to give O- as it wont get destroyed and wont affect the fetus in any way. Similar mechanism to giving platelets to someone with TTP, HUS, etc. they just get destroyed so its useless +  
tylerwill33  In utero, should give O- to avoid mom attacking again. After birth, O+ probably better. +  

 +3  upvote downvote
submitted by keycompany(268),
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,O v-eetaiRghn ldobo si eth vauseirnl nrood orf lodbo a.amslp

keycompany  Edit:: Blood RBCs*** +4  

The mother is Rh - & fetus is Rh +

pg 397 FA 2019 Administration of anti-D IgG to Rh - pregnant mother during 3rd trimester & early postpartum period (if fetus Rh+)

Prevents maternal anti-D IgG production

anti-D IgG = O, Rh -

snripper  Not sure why you're getting downvoted, but this makes sense to me. Maybe because you're claiming that the fetus is Rh+ when it's not clearly stated? But take that away and your explanation still makes sense. +1  
j000  the question is not asking what to give to the mother. it's asking what to give to the fetus. +