Supplementary Material for: Modeled Daily Ingested, Absorbed and Bound Phosphorus: New Measures of Mineral Balance in Hemodialysis Patients

Background: Control of predialysis serum phosphorus in hemodialysis patients is challenging. We explored the utility of a novel kinetic phosphorus modeling program. Methods: As part of a quality assurance program, urea kinetic modeling results were combined with those from phosphorus kinetic modeling to compute modeled daily ingested phosphorus (DIP) and components making up this metric, including absorbed, bound, and nonabsorbed, nonbound phosphorus. Results: In 182 hemodialysis patients, DIP averaged 1,089 ± 348 mg/day in men and 934 ± 292 in women (p p p p Conclusions: The combination of urea kinetic and phosphorus modeling can be used to estimate measures related to phosphorus intake. High DIP/PCR or DIP/kg body weight values in anuric patients suggest consumption of a diet high in phosphorus additives or noncompliance with the prescribed amount of phosphorus binders.