IGHE and cystic fibrosis: Leukocyte count correlated negatively with Arg concentration (rp = −0.342, p = 0.004, n = 68), citrulline concentration (rS = −0.271, p = 0.024; n = 69) and the Arg/ADMA ratio (rP = −0.328, p = 0.006, n = 68) Median IgE levels in CF patients were 60.5 IE/mL (25–75th percentile: 12.0–256.7 IE/mL).