The following information was obtained in a 20 -year-old college student who was participating in a research study in the Clinical Research Unit:

Assuming that $\mathrm{X}$ is freely filtered, which of the following statements is most correct?

Question

The following information was obtained in a 20 -year-old college student who was participating in a research study in the Clinical Research Unit:
 
Assuming that $\mathrm{X}$ is freely filtered, which of the following statements is most correct?

Quizplus · Accepted Answer

[II C 1]. To answer this question, calculate the glomerular filtration rate (GFR) and $\mathrm{C}_{\mathrm{X}}$. GFR $=150 \mathrm{mg} / \mathrm{mL} \times 1 \mathrm{~mL} / \mathrm{min} \div 1 \mathrm{mg} / \mathrm{mL}=150 \mathrm{~mL} / \mathrm{min} . \mathrm{C}_{\mathrm{X}}=100 \mathrm{mg} / \mathrm{mL} \times$ $1 \mathrm{~mL} / \mathrm{min} \div 2 \mathrm{mg} / \mathrm{mL}=50 \mathrm{~mL} / \mathrm{min}$. Because the clearance of $\mathrm{X}$ is less than the clearance of inulin (or GFR), net reabsorption of X must have occurred. Clearance data alone cannot determine whether there has also been secretion of X. Because GFR cannot be measured with a substance that is reabsorbed, $\mathrm{X}$ would not be suitable.

The Following Information Was Obtained in a 20 -Year-Old College X\mathrm{X}X

The Following Information Was Obtained in a 20 -Year-Old College $\mathrm{X}$