GPT and cystic fibrosis: The patients with CF had normal AST (T1: 23 U/l (19|16) vs. T2: 26 U/L (23|32), p = 0.82), ALT (T1: 23 U/L (15|27) vs. T2: 31 U/L (23|43), p = 0.09), and creatinine values (T1: 63 U/L (54|74) vs. T2: 63 U/L (49|78), p = 0.75).