This study validates Ing's partial dialysate collection method, which
employs proportionate collection using a side tube capped with a small
-gauge plastic needle. The urea nitrogen and creatinine levels of the
small representative fraction of spent dialysate collected in the abov
e fashion are undistinguishable from those obtained from the total spe
nt dialysate. The estimated urea nitrogen removed during hemodialysis
using this approach is similar to that using the total dialysate colle
ction method; Ing's method is simple and useful in quantifying the dia
lysis dosage and in its assessment of the nutritional status of patien
ts on hemodialysis.