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NBME 18 Answers

nbme18/Block 4/Question#15 (10.4 difficulty score)
45 yo man follows up 1 week after appendectomy
Gilbert syndrome🔍
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pg32  Went with hepatitis because of his recent surgery. Seen problems like this before where recent surgery means they were given inhaled anesthetic that can cause hepatotoxicity/hepatitis. That, along with the elevated AST/ALT and unconjugated bilirubinemia (signifying liver losing its ability to conjugate bilirubin due to inflammation) made me pick hepatitis. Why is that wrong? +  
suckitnbme  @pg32 AST/ALT are only slightly elevated. The patient also is not particularly symptomatic. He's really not that sick. Hepatoxicity is also most associated with halothane which is no longer used in the US. It would be a different story if the patient had surgery done in a different country (as is common in Uworld questions on this) +3  
mumenrider4ever  I don't know why NBME uses ALT/AST reference ranges from 8-20 u/L when the reference ranges for uworld are 8-40 u/L. So maybe his liver enzymes aren't really elevated since they're below 40 +2