Agreements among iothalamate-based GFR, eGFR and GFR-MRI. Correlations between iothalamate based GFR and estimated GFR (BSA indexed and non-indexed) are shown, as well as GFR estimated by MRI model. The MRI model predicting indexed iothalamate based GFR included average heart rate, peak aorta flow below the kidney artery take-offs, average kidney artery blood flow, average peak kidney vein blood flow, age, and sex. The MRI model predicting absolute iothalamate based GFR includes average heart rate, peak aorta flow below kidney artery take-offs, average kidney vein blood flow, average peak kidney vein blood flow, age, and sex. Note: CKiD U25 and FAS were calculated according to Pottel et al., NDT 2015, PMID: 26932693.