title: Extraction fraction at any urine flow and extraction percentage.
abstract: Extraction fraction of renal solutes is ordinarily calculated as a ratio of arterial and venous concentration differences. Calculations provided in the present manuscript illustrate the need to correct for changes in renal venous concentration when solute extraction is low and urine flow simultaneously high.
mesh_terms: D006801:Humans; D007668:Kidney / Q000098:blood supply / Q000502:physiology*; D007677:Kidney Function Tests; D008954:Models, Biological; D012039:Regional Blood Flow; D012077:Renal Artery; D012082:Renal Veins