In SIADH, which urine findings are typical?

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Multiple Choice

In SIADH, which urine findings are typical?

Explanation:
Excess ADH in SIADH causes the kidneys to retain water while the body remains euvolemic, leading to hyponatremia with a concentrated urine. The body reduces volume loss by excreting sodium, so urine sodium becomes elevated. At the same time, ADH keeps the collecting ducts permeable to water, so the urine stays concentrated despite low serum osmolality. The typical pattern is a high urine sodium along with an inappropriately high urine osmolality (urine osmolality well above that of the plasma, often >300 mOsm/kg). This combination reflects the persistent antidiuretic effect even in the setting of hyponatremia.

Excess ADH in SIADH causes the kidneys to retain water while the body remains euvolemic, leading to hyponatremia with a concentrated urine. The body reduces volume loss by excreting sodium, so urine sodium becomes elevated. At the same time, ADH keeps the collecting ducts permeable to water, so the urine stays concentrated despite low serum osmolality. The typical pattern is a high urine sodium along with an inappropriately high urine osmolality (urine osmolality well above that of the plasma, often >300 mOsm/kg). This combination reflects the persistent antidiuretic effect even in the setting of hyponatremia.

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