In SIADH, what is typically observed regarding urine sodium and urine osmolality?

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Multiple Choice

In SIADH, what is typically observed regarding urine sodium and urine osmolality?

Explanation:
In SIADH, the body retains water due to excess ADH, producing hyponatremia while the patient remains euvolemic. The kidneys continue to excrete sodium despite the low serum sodium, so urine sodium is elevated (often >20–40 mEq/L). At the same time, ADH prevents the urine from becoming maximally dilute, so urine osmolality stays inappropriately high (typically above 100 mOsm/kg). This combination—high urine sodium with high urine osmolality—fits SIADH best. If the urine were dilute or the sodium excretion low, it would point away from SIADH and toward other states like volume depletion or appropriate ADH suppression.

In SIADH, the body retains water due to excess ADH, producing hyponatremia while the patient remains euvolemic. The kidneys continue to excrete sodium despite the low serum sodium, so urine sodium is elevated (often >20–40 mEq/L). At the same time, ADH prevents the urine from becoming maximally dilute, so urine osmolality stays inappropriately high (typically above 100 mOsm/kg). This combination—high urine sodium with high urine osmolality—fits SIADH best. If the urine were dilute or the sodium excretion low, it would point away from SIADH and toward other states like volume depletion or appropriate ADH suppression.

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