Which pattern is most consistent with SIADH?

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Multiple Choice

Which pattern is most consistent with SIADH?

Explanation:
SIADH causes the body to retain water due to excess ADH. That extra water in the bloodstream dilutes the serum, lowering serum osmolality. At the same time, ADH keeps the kidneys from excreting dilute urine, so urine remains concentrated and the urine osmolality stays high. So the pattern that fits SIADH is low serum osmolality with high urine osmolality. If serum osmolality were high or urine osmolality were low, those patterns would point to other conditions, not SIADH.

SIADH causes the body to retain water due to excess ADH. That extra water in the bloodstream dilutes the serum, lowering serum osmolality. At the same time, ADH keeps the kidneys from excreting dilute urine, so urine remains concentrated and the urine osmolality stays high. So the pattern that fits SIADH is low serum osmolality with high urine osmolality. If serum osmolality were high or urine osmolality were low, those patterns would point to other conditions, not SIADH.

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