In the UK, all OB/Gyn specialists undergo specialist training to sit several exams and then be awarded the MRCOG (Membership of the Royal College of Obstetricians and Gynaecologists). Later on in training, the trainees can subspecialise.
An Obstetrician will focus on pregnancy and its health problems, and become feto-maternal specialists with an expertise in pregnancy scanning, and prenatal diagnosis. Obstetricians will carry out deliveries and also perform amniocentesis and chorionic villous sampling (prenatal diagnosis).
A Gynaecologist will specialise in the treatment and management of the female reproductive organs and genitalia. Gynaecologists will treat not only heavy periods, and fibroids, but also bladder dysfunction and pelvic cancers. There are several Gynaecological subspecialities: including Gynaecological Oncology (Genital Cancer), Reproductive medicine (Fertility) and Urogynaecology (Urinary incontinence and prolapse).