Which of the following would best distinguish an otherwise healthy person with severe water deprivation from a person with the syndrome of inappropriate antidiuretic hormone (SIADH)?

Question

Quizplus · Accepted Answer

[VII B, D 4; Table 5.6]. Both individuals will have hyperosmotic urine, a negative free-water clearance $\left(-\mathrm{C}_{\mathrm{H}_{2} \mathrm{O}}\right)$, a normal corticopapillary gradient, and high circulating levels of antidiuretic hormone (ADH). The person with water deprivation will have a high plasma osmolarity, and the person with syndrome of inappropriate antidiuretic hormone (SIADH) will have a low plasma osmolarity (because of dilution by the inappropriate water reabsorption).

Which of the Following Would Best Distinguish an Otherwise Healthy (CH2O)\left(\mathrm{C}_{\mathrm{H}_{2} \mathrm{O}}\right)(CH2​O​)

Which of the Following Would Best Distinguish an Otherwise Healthy $\left(\mathrm{C}_{\mathrm{H}_{2} \mathrm{O}}\right)$