We read with interest the paper by Bertenshaw et al1 on the incidence of acute renal failure (ARF) in patients with cystic fibrosis (CF) and would like to supplement these results with our findings. With increasing survival and therefore consideration for lung transplantation, monitoring adult patients with CF for renal impairment is assuming increasing importance (creatinine clearance <50 mg/ml/min is a contraindication to lung transplantation).2

We examined …