Both the Acute kidney injury (AKI) classification system and the nonsteady-state (kinetic) estimated glomerular filtration rate (KeGFR) are complementary to each other. Assessing both AKI stage and KeGFR can help to identify patients at different risk levels in clinical practice. In general, there was not a good agreement between AKI severity and the worst achieved KeGFR. The stepwise reduction in the worst achieved KeGFR conferred an incremental risk of death, rising from 7.0% (KeGFR > 70 ml/min/1.73 m2) to 27.8%.

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