We have in vitro and in vivo tested the new Gambro Lundia Mini-Minor pediatric dialyzer with the 17 µm membrane. By utilizing blood tubing sets of different volumes in conjunction with the Lundia Mini-Minor we feel that this dialyzer is well suited to use in pediatric patients weighing less than 16–23 kg. During the last 4 years, with the development of improved equipment and techniques, it has become increasingly easier to hemodialyze children and infants with end-stage and acute renal failure [1,2]. We have previously reported our experience with hemodialyzers designed especially for children and babies [1–5,13,14]. This report concerns our experience with a new disposable pediatric hemodialyzer, the Lundia Mini-Minor, which has been designed for the smaller pediatric patient weighing less than 1