In Ontario, the validated algorithm for chronic kidney disease identifies older adults with a median estimated glomerular filtration rate of 38 mL/min/1.73 m2 (IQR, 27 to 52 mL/min/1.73 m2), whereas its absence identifies those with a median estimated glomerular filtration rate of 69 mL/min/1.73 m2 (IQR, 56 to 82 mL/min/1.73 m2) (34).