What BUN/Cr ratio is typical in SIADH-related hyponatremia?

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Multiple Choice

What BUN/Cr ratio is typical in SIADH-related hyponatremia?

Explanation:
The main idea is how the BUN to creatinine ratio helps distinguish causes of hyponatremia. In SIADH, hyponatremia is euvolemic with preserved renal function, so BUN isn’t disproportionately elevated and creatinine stays normal. This yields a BUN/Cr ratio that is typically under 20:1 (often in the range of about 10–20:1). In contrast, prerenal states from volume depletion raise BUN more than creatinine, pushing the ratio above 20:1. So, for SIADH-related hyponatremia, a low BUN/Cr ratio (<20:1) is most typical.

The main idea is how the BUN to creatinine ratio helps distinguish causes of hyponatremia. In SIADH, hyponatremia is euvolemic with preserved renal function, so BUN isn’t disproportionately elevated and creatinine stays normal. This yields a BUN/Cr ratio that is typically under 20:1 (often in the range of about 10–20:1). In contrast, prerenal states from volume depletion raise BUN more than creatinine, pushing the ratio above 20:1. So, for SIADH-related hyponatremia, a low BUN/Cr ratio (<20:1) is most typical.

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