AVP and clostridium difficile infection: A principal diagnostic of CDI in children by Bonnet et al., 2021 [25] and Winzeler et al., 2019 [18] reported the use of a copeptin threshold of 3.53 pmol/L having a sensitivity of 100% and a specificity of 87.4%, and copeptin dosing after arginine stimulation test with a cutoff of 3.8 pmol/L with a sensitivity of 93% and a specificity of 92%.