This version was machine-translated from German and has not been medically reviewed. The authoritative version is the German version.
TmP/GFR – renal phosphate threshold
According to Payne from TRP and serum phosphate, with reference range by age and sex (1–73 years)
Calculation aid for healthcare professionals: the calculator reproduces what the sources cited assign to the inputs. Clinical assessment and every treatment decision remain with the treating physician. Inputs and results are not stored.
Frequently asked questions
TmP/GFR – renal phosphate threshold: What does this calculator compute?
Calculates TmP/GFR (phosphate threshold) from TRP and serum phosphate – linear at TRP ≤ 0.86, corrected according to Payne in adults with TRP > 0.86 – and compares the result with the age- and sex-specific reference ranges of Derain Dubourg 2022 (fasting sample).
TmP/GFR – renal phosphate threshold: Which sources is this calculator based on?
Payne RB: Renal tubular reabsorption of phosphate (TmP/GFR): indications and interpretation (Ann Clin Biochem 35:201–206) (1998); Derain Dubourg L, Aurelle M, Chardon L, Flammier S, Lemoine S, Bacchetta J: Tubular phosphate handling: references from child to adulthood in the era of standardized serum creatinine (Nephrol Dial Transplant 37:2150–2156) (2022); Emmens JE et al.: Assessment of Proximal Tubular Function by Tubular Maximum Phosphate Reabsorption Capacity in Heart Failure (Clin J Am Soc Nephrol 17:228) (2022); Walton RJ, Bijvoet OL: Nomogram for derivation of renal threshold phosphate concentration (Lancet 2:309–310) (1975)