Question: how gfr is measured clinically?
Answer: GFR is measured as the clearance of exogenous filtration markers that are eliminated exclusively by glomerular filtration, including inulin, iohexol, iothalamate, technetium 99m diethylenetriamine pentaacetic acid (99mTc-DTPA) and chromium 51-ethylenediamine tetraacetic acid (51Cr-EDTA).