Figure 2. Mean plasma concentrations of blood urea nitrogen and β₂-microglobulin during conventional hemodialysis before WAK and paired WAK treatment study periods.

Data are presented as mean ± SD for each time point. (A) Blood urea nitrogen (mg/dl). (B) Plasma β₂-microglobulin (mg/l). HD, hemodialysis; WAK, wearable artificial kidney.