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NBME 24 Answers

nbme24/Block 3/Question#36

A 1-month-old male newborn is brought to the ...

Tyrosine

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submitted by zelderonmorningstar(9),

Can someone explain why the answer couldn’t be phenylalanine?

donutsnduodenums  The kid has albinism, which is due to decreased tyrosinase activity. If he has a problem metabolizing Phenylalanine, he would be presenting with the PKU sx like intellectual disability, musty body odor, etc., in addition to his fair complexion. +3  
zelderonmorningstar  I see, so if it was PKU he wouldn’t just be presenting for a routine examination. It would be one of those “oh crap what’s wrong with my baby” ones. +2  
wowo  FA2019 p83 +  
nbme4unme  Just a note that UWorld says phenylketonuria patients ALSO have albinism, it's just that the neuro sx and musty order are giveaways. +1