Careful measurements of GFR are made by injection of ________, but approximations of GFR can be made more simply by measuring renal plasma clearance of ________.
A) creatine phosphate; insulin
B) insulin; creatine phosphate
C) inulin; creatinine
D) creatinine; inulin

Question

Quizplus · Accepted Answer

Inulin is used for precise GFR measurements because it is freely filtered and not reabsorbed or secreted. Creatinine clearance is used for approximations as it is naturally occurring and easier to measure.

Careful Measurements of GFR Are Made by Injection of ________