FIGURE 5.

Percent error in K_RU estimated based on (A) the new equation using the postdialysis SUN from the dialysis session following the urine collection, (B) the recommendation of dividing the per-minute UN excretion rate during the urine collection by 90% of the predialysis SUN, (C) Jindal’s equation [7] and (D) the recommendation of dividing the per-minute UN excretion rate during the urine collection by the average of the measured postdialysis SUN of the dialysis session prior to the collection period and the predialysis SUN of the dialysis session following the collection. No correction for serum water. Cases analyzed in Figures (C) and (D) were limited to instances where the urine collection period included the entire IDI and where the preceding postdialysis SUN was measured (n = 44). Gray triangles, black circles and open squares in (A) and (B) indicate data from patients on ≤2-times, 3-times and 4-times weekly HD, respectively. Black circles and open squares in (C) and (B) indicate data from 3-times weekly HD patients on Monday–Wednesday–Friday and Tuesday–Thursday–Saturday schedules, respectively.