Obstetrics and gynaecology commonly abbreviated as ob gyn obg or og in us english and as obs and gynae in british english is the medical specialty that encompasses the two subspecialties of obstetrics covering pregnancy childbirth and the post partum period and gynaecology covering the health of the female reproductive system vagina uterus and ovaries. What is the difference between obstetrics and gynecology posted august 4 2016 obstetrics and gynecology are medical specialties that focus on two different aspects of the female reproductive system. The clinic has one of the largest and most respected obstetrics and gynecology practices in the world with more than 55 specialists committed to providing comprehensive multidisciplinary medical and surgical care to women at its campuses in arizona florida and minnesota. Obstetrics gynecology is the official publication of the american college of obstetricians and gynecologists acog popularly known as the green journal obstetrics gynecology publishes original articles and research studies on scientific advances new medical and surgical techniques obstetric management and clinical evaluation of drugs and instruments