Reference ranges for measured glomerular filtration rate (mGFR) derived from one population may not apply to another, leading to potential misclassification of kidney health when universal cut-offs are applied. Establishing accurate, population-specific mGFR reference ranges helps precisely interpret individual results, tailor interventions, and potentially improve outcomes. Glomerular filtration rate (GFR) measurements using exogenous filtration markers in Asians have suggested a lower GFR range than in Europeans and Americans 1-3.