OB/GYN residency is four years long. That’s 48 months of accredited graduate medical education, which is the minimum required to sit for board certification through the American Board of Obstetrics and Gynecology (ABOG). If you pursue a subspecialty fellowship afterward, add another three to four years on top of that.
What the Four Years Look Like
OB/GYN residency is organized into four-week rotation blocks that progress in responsibility and independence. In the first year (PGY-1), residents spend heavy time on labor and delivery, general gynecology, and gynecologic oncology, along with shorter stints in the emergency department, surgical ICU, and pediatric gynecology. The focus is on building foundational skills: delivering babies, assisting in surgeries, and learning to manage acute situations.
By the second year, residents rotate through more specialized areas like maternal-fetal medicine, urogynecology, and minimally invasive gynecologic surgery, while continuing obstetrics and gynecology rotations. Night float shifts, where residents cover the labor floor overnight, are spread across years one through four.
The third year introduces advanced surgical responsibilities, more subspecialty exposure, and elective time. Residents also take on teaching roles with junior residents. In the fourth year, residents serve as chief (senior) residents, a requirement for board eligibility. This year typically includes a mix of obstetrics, maternal-fetal medicine, minimally invasive surgery, gynecologic oncology, and reproductive endocrinology rotations, with additional elective blocks to explore areas of interest.
Surgical Volume Requirements
OB/GYN is one of the more procedure-heavy residencies. The ACGME sets minimum case numbers that every graduating resident must meet, and the totals are substantial. Over four years, residents need at least 200 spontaneous vaginal deliveries, 145 cesarean deliveries, and 15 operative vaginal deliveries (forceps or vacuum-assisted). On the surgical side, they must complete at least 85 total hysterectomies spread across abdominal, vaginal, and laparoscopic approaches, plus 60 laparoscopies, 40 hysteroscopies, and 25 surgeries for invasive cancer.
Other required minimums include 50 obstetric ultrasounds, 50 transvaginal ultrasounds, 25 pelvic floor or incontinence procedures, and 10 cystoscopies. These are floors, not targets. Programs aim for residents to exceed them, and hitting the minimum doesn’t automatically signal competence.
Weekly Hours and Workload
ACGME rules cap resident work hours at 80 per week, averaged over a four-week period. That cap includes all clinical duties, educational activities, work done from home, and any moonlighting. In practice, OB/GYN residents often work close to that ceiling, especially during labor and delivery and night float rotations. The unpredictable nature of childbirth means shifts can stretch when patients are in active labor or complications arise.
Board Certification After Residency
Finishing residency doesn’t automatically make you board certified. ABOG requires a two-step process. The first step is a qualifying exam, which graduates can take after completing all 48 months of training. After passing, residents must also document completion of a surgical skills certification program before moving on to the certifying exam.
There’s a time limit: you must pass both steps within eight years of finishing residency. Time spent in a fellowship or second residency doesn’t count against that clock. If you fail to become certified within eight years, you’ll need to complete at least six months of supervised practice at a hospital affiliated with an accredited training program before trying again.
Subspecialty Fellowships Add Three to Four Years
After completing the four-year residency, some OB/GYNs pursue fellowship training in a subspecialty. The major options and their typical lengths:
- Maternal-fetal medicine: 3 years, focused on high-risk pregnancies and complex prenatal care
- Reproductive endocrinology and infertility: 3 years, covering fertility treatments, hormonal disorders, and assisted reproductive technology
- Gynecologic oncology: 3 to 4 years, training in surgical and medical management of reproductive cancers
- Female pelvic medicine and reconstructive surgery (urogynecology): 3 years, specializing in pelvic floor disorders and incontinence
Fellowship positions are competitive and filled through the National Resident Matching Program’s subspecialty match, which runs on a separate timeline from the main residency match.
Total Training Timeline
To put the full path in perspective: four years of undergraduate education, four years of medical school, then four years of OB/GYN residency brings the total to 12 years after high school before you’re practicing independently. A subspecialty fellowship pushes that to 15 or 16 years. For someone entering residency, the four years of training typically begin on July 1 and end on June 30 four years later, though exact dates vary slightly by program.
The residency application process itself starts about a year before training begins. Medical students submit applications through ERAS (the Electronic Residency Application Service) in early September, interview through the fall and winter, and learn their placement through the Match in mid-March. Programs then begin reviewing the next cycle’s applications the following September, keeping the pipeline continuous.