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NBME 24 Answers

nbme24/Block 1/Question#14

A thin 66-year-old man is brought to the emergency ...

Urine osmolality > plasma osmolality

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submitted by m-ice(116),

In SIADH, the excessive ADH causes the collecting duct of the kidney to reabsorb huge amounts of water that it should normally excrete. That means that the plasma will now have much more water relative to solute (low osmolality) and the urine will have much more salt relative to water (higher osmolality).