Obstetrics is the medical specialty focused on pregnancy, childbirth, and the postpartum period. It covers everything from preconception planning through the roughly six to eight weeks after delivery, when the body returns to its pre-pregnancy state. Doctors who practice obstetrics, called obstetricians, are trained to manage both routine pregnancies and complex complications that can arise at any stage.
What Obstetrics Covers
The scope of obstetrics spans three distinct phases: prenatal care (before and during pregnancy), labor and delivery, and postpartum recovery. A healthy pregnancy begins before conception, with screening for conditions that could affect a developing baby, and continues with regular monitoring until the reproductive system has fully recovered after birth.
This makes obstetrics different from gynecology, which deals with women’s health more broadly, including cancer screenings, urinary tract issues, and reproductive health outside of pregnancy. In practice, most physicians train in both fields and carry the title OB/GYN. Some OB/GYNs even serve as primary care doctors. But a physician who focuses strictly on obstetrics does not treat health issues unrelated to pregnancy, while a physician who focuses strictly on gynecology does not deliver babies.
Prenatal Care and Screening
Prenatal visits typically happen about every four weeks during the first trimester, becoming more frequent as the pregnancy progresses. The first appointment is the longest and most involved. It usually includes a physical exam, a pelvic exam, and blood work to check your blood type, Rh status, and hemoglobin levels. You’ll also be tested for immunity to infections like rubella and chickenpox, and screened for hepatitis B, syphilis, gonorrhea, chlamydia, and HIV. A urine sample checks for bladder or urinary tract infections.
Genetic screening has become a standard part of prenatal care. Blood tests and ultrasound can assess the risk of chromosomal conditions like Down syndrome. For pregnancies with higher risk factors, a first-trimester ultrasound is typically performed between 10 and 14 weeks. If only one ultrasound is done during the entire pregnancy, guidelines recommend scheduling it at 18 to 22 weeks, when it’s most useful for detecting fetal anomalies and growth abnormalities. By about 12 to 14 weeks, your provider can usually detect the baby’s heartbeat using a handheld device that bounces sound waves off the fetal heart.
Ultrasounds come in two forms. A transabdominal scan uses a probe on the outside of the belly and requires a full bladder for better imaging. If that doesn’t produce clear results, a transvaginal scan with an internal probe can offer higher resolution, especially early in pregnancy when the fetus is very small.
Labor and Delivery
When it’s time to give birth, obstetric care involves a range of possible interventions depending on how labor progresses. The most common is continuous electronic fetal monitoring, used in roughly 80% of hospital births to track the baby’s heart rate. Oxytocin-based induction, which uses a synthetic hormone to stimulate contractions, is similarly widespread. Other interventions during the first stage of labor include amniotomy (manually breaking the amniotic sac to speed labor), pain-relief medications, and epidural anesthesia.
During the pushing stage, an episiotomy (a small incision to widen the vaginal opening) occurs in close to half of deliveries at some institutions, though rates vary widely depending on the hospital and provider. Vacuum-assisted delivery and other hands-on techniques are less common, used in only about 1% of births. Cesarean sections are a major part of modern obstetrics. In the United States, roughly one in three births is a C-section, a surgical delivery through the abdomen and uterus.
High-Risk Pregnancies
Certain conditions push a pregnancy into the high-risk category, which means more frequent monitoring and potentially a referral to a maternal-fetal medicine specialist, also called a perinatologist. These doctors complete the standard OB/GYN training plus an additional three years focused on medical complications related to pregnancy and fetal problems. They also interpret most specialized prenatal ultrasounds.
Pre-existing conditions like diabetes, lupus, kidney disease, high blood pressure, and obesity can all elevate risk. A maternal-fetal medicine specialist might adjust your medications before you conceive to protect a future pregnancy, or help you optimize blood sugar control to reduce the chance of birth defects. Genetic risks are another common reason for referral. If your family history or ethnic background increases the chance of conditions like sickle cell disease or Tay-Sachs disease, preconception genetic screening can determine whether you or your partner carry relevant genes. If a fetal anomaly is found during pregnancy, the perinatologist coordinates care for both you and the baby, often working alongside a pediatric team.
Postpartum Care
Obstetric care doesn’t end at delivery. The postpartum period generally lasts six to eight weeks, though the full recovery process can stretch to six months. It unfolds in three phases.
The acute phase covers the first 6 to 12 hours after birth. This is when serious complications like postpartum hemorrhage are most likely, so providers closely watch blood pressure, heart rate, and bleeding. The subacute phase runs from about 24 hours to six weeks post-delivery. Your body is still changing rapidly, and providers monitor for issues like postpartum depression, urinary incontinence, and heart-related complications. The delayed phase extends from roughly six weeks to six months after birth. Changes are more gradual here, as muscles and tissues slowly return to their pre-pregnancy state. Pelvic floor dysfunction, painful intercourse, and uterine prolapse are concerns your provider may address during this window.
Who Provides Obstetric Care
Obstetricians hold either an M.D. or D.O. degree and complete four years of residency training in obstetrics and gynecology, accredited by a national governing body. During residency, they serve as chief resident and must complete a surgical skills certification program. Board certification through the American Board of Obstetrics and Gynecology requires passing both a qualifying exam and a certifying exam. This training equips them to handle everything from routine prenatal visits to emergency C-sections.
Certified nurse-midwives (CNMs) are another option for obstetric care. They hold advanced degrees and are trained to manage normal pregnancies, provide prenatal care, perform vaginal deliveries, and handle postpartum follow-up. Midwives often offer a broader range of non-medical pain management options during labor. However, they are not surgeons. If complications arise during pregnancy or delivery, a midwife will refer you to an OB/GYN. This collaborative model is common: midwives handle low-to-moderate-risk pregnancies while working closely with obstetricians who step in when the level of medical complexity increases.
Choosing between a midwife and an obstetrician often comes down to your risk profile and your preferences for the birth experience. For pregnancies without significant complications, either provider can deliver excellent care. For pregnancies involving pre-existing conditions, multiple babies, or known fetal abnormalities, an obstetrician or maternal-fetal medicine specialist is the appropriate choice.