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NBME 16 Answers

nbme16/Block 3/Question#7 (8.0 difficulty score)
A 15-year-old girl is brought to the ...
Increased absorption of calcium in the gastrointestinal tractπŸ”
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 +5 
submitted by bingcentipede(208),

Her calcium is only a little higher than normal (upper limit 10.2) due to the excess vitamin D supplements she took. According to FA '19 (p. 70), activated vitamin D:

-Increases intestinal absorption of calcium and phosphorus --This is what increase her calcium concentration in the serum -Increases bone mineralization (lower levels) -Increases bone resorption (higher levels)