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NBME 21 Answers

nbme21/Block 1/Question#37 (20.7 difficulty score)
A 35-year-old man with diabetic ketoacidosis ...
Serum potassium concentrationπŸ”
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 +2 
submitted by nala_ula(101),
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cienfuegos  Additional UW fun facts regarding Potassium and DKA: use caution giving insulin and IV fluids to dehydrated hyperglycemic because i forces K in cells causing fast decrease of extracellular Potassium, thus give K supplementation even when serum K elevated +3  
linwanrun1357  Why urine K+ does not decrease? +3  

This explanation is faulty. Insulin causes K to go inside via upregulating NaKATPase activity. Nothing to with H+ exchange as far as Insulin is concerned.

H and K exchange is separate from this.

+11/- b1ackcoffee(35),