To demonstrate how patients' probability of having chronic kidney disease (CKD) stage 3-5 (measured GFR 90% only when eGFR is 90% already when eGFR is 59 mL/min/1.73 m(2) in a screening population, whereas it is 88 mL/min/1.73 m(2) in a CKD population.
Instead of reporting diagnostic accuracy as sensitivity, specificity, and predictive values, actual eGFR supplemented with the probability that it represents a true GFR