Establishment of reference intervals for estimated glomerular filtration rate in apparently healthy adults based on the full age spectrum equation: A single-centre study

BackgroundIdentifying gender and age-related eGFR trends is crucial for precise renal function assessment. This study aims to analyse eGFR distribution with the full age spectrum (FAS) equation and establish reference intervals based on gender and age in a single-centre cohort.MethodsFollowing the inclusion and exclusion criteria outlined in this study, a total of 24,024 reference individuals were ultimately selected. Using the approach recommended by the CLSI C28-A3 guidelines, we assessed the distribution of eGFR across different gender and age groups. The two-sided nonparametric method (P_2.5-P_97.5) was applied to establish the eGFR reference intervals for a healthy Chinese population.ResultsThe eGFR levels in healthy adults exhibited a non-normally distributed pattern. Notably, there were significant differences in eGFR levels between males and females, with females showing a notably higher eGFR level than males. Additionally, eGFR levels demonstrated significant variations across different age groups within both male and female cohorts. As age increased, eGFR showed a significant decline, except in individuals aged 20-29 and 30-39 years. Therefore, reference intervals for eGFR were created based on both gender and age.ConclusionsWe established the reference interval for eGFR using the FAS equation, drawing from a large sample population at a single centre. This establishes a potential framework for evaluating renal function in healthy individuals and for diagnosing and treating kidney-related diseases.