A cross sectional study found that substantial discrepancies exist between individual estimated glomerular filtration rate (eGFR) and directly measured GFR (mGFR). Laboratory reports that provide eGFR calculations should consider including the distribution of this uncertainty. According to the authors, renaming the eGFR as a population average GFR (or paGFR) merits further discussion. The findings are published in Annals of Internal Medicine.