Measured GFR in healthy aging*

Age at midpoint (years)	Measured GFR (mL/min per 1.73 m²)
Age at midpoint (years)	URL (±SD)	LRL (±SD)	Mean (±SD)
25	136 (8)	78 (6)	107 (6)
35	134 (7)	77 (5)	107 (6)
45	129 (7)	70 (6)	103 (6)
55	119 (10)	62 (11)	92 (9)
65	114 (10)	55 (7)	83 (9)
75	103 (11)	49 (5)	76 (10)

GFR: glomerular filtration rate; URL: upper reference limit; SD: standard deviation; LRL: lower reference limit.
* Age-specific reference limits for measured GFR based upon 633 potential living kidney donors.

Data From: Pottel H, Delanaye P, Weekers L, et al. Age-dependent reference intervals for estimated and measured glomerular filtration rate. Clin Kidney J 2017; 10:545.

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