The pattern of Serum CORT decreased, Na+ low, K+ high, urine osmolality high suggests which condition?

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Multiple Choice

The pattern of Serum CORT decreased, Na+ low, K+ high, urine osmolality high suggests which condition?

The pattern points to adrenal insufficiency with both glucocorticoid and mineralocorticoid deficiency. When aldosterone is low, the kidneys excrete more sodium and retain potassium, leading to hyponatremia and hyperkalemia. Cortisol deficiency further reduces the body's ability to maintain vascular tone and water balance, which, combined with volume loss, drives the release of ADH and results in water reabsorption and a concentrated urine (high urine osmolality). So the lab pattern—low sodium, high potassium, low cortisol, and concentrated urine—fits Addison’s disease with hypoaldosteronism. Other conditions don’t fit as well: SIADH can cause hyponatremia with concentrated urine but usually has normal cortisol and doesn’t explain the high potassium. Conn’s disease causes hypernatremia and hypokalemia due to excess aldosterone. Diabetes insipidus leads to dilute urine and often hypernatremia, not high urine osmolality.

The pattern points to adrenal insufficiency with both glucocorticoid and mineralocorticoid deficiency. When aldosterone is low, the kidneys excrete more sodium and retain potassium, leading to hyponatremia and hyperkalemia. Cortisol deficiency further reduces the body's ability to maintain vascular tone and water balance, which, combined with volume loss, drives the release of ADH and results in water reabsorption and a concentrated urine (high urine osmolality). So the lab pattern—low sodium, high potassium, low cortisol, and concentrated urine—fits Addison’s disease with hypoaldosteronism.

Other conditions don’t fit as well: SIADH can cause hyponatremia with concentrated urine but usually has normal cortisol and doesn’t explain the high potassium. Conn’s disease causes hypernatremia and hypokalemia due to excess aldosterone. Diabetes insipidus leads to dilute urine and often hypernatremia, not high urine osmolality.

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