CP and Hyperinsulinemia: Patients with IAs usually have a higher FINS level, an unaffected C-peptide concentration and a higher FINS/CP ratio (25–27).We found that the FINS/CP ratio ≥ 9.3uIU/ng (0.19 molar ratio) demonstrated high sensitivity for screening the presence of IAs in patients with C-INS and hyperinsulinemia.