Gynaecology & Obstetrics General c5f1d936 O'Sullivan & Mahan criteria is used in :-- A Gestational hypertension B Gestational diabetes mellitus C Rh incompatibility D Assessing progress of labour High-Yield Explanation Diagnosis of Gestational Diabetes Mellitus (GDM ) is made following a 100 gm glucose load based on criteria laid down by O'Sullivan and Mahan.