 Postgraduate training programs for both fields are usually combined, preparing the practicing obstetrician-gynecologist to be adept both at the care of female reproductive organs' health and at the management of pregnancy, although many doctors go on to develop subspecialty interests in one field or the other.After completing medical school, one must complete a four-year residency program to be eligible to sit for boards.For the ERAS match in 2017, there were 238 participating programs accepting applicants.