An anesthesiologist is a doctor. Specifically, an anesthesiologist is a physician who has completed medical school and earned an MD or DO degree, followed by a four-year residency in anesthesiology. The confusion usually comes from the fact that another professional, called a nurse anesthetist (CRNA), also provides anesthesia care but follows a completely different training path rooted in nursing.
Both roles exist in operating rooms across the country, and patients often encounter either one without fully understanding the distinction. Here’s how the two compare and what it means for your care.
What an Anesthesiologist Actually Is
An anesthesiologist is a medical doctor who directs anesthesia care, pain management, and critical care before, during, and after surgery. Like your primary care doctor, an anesthesiologist manages all aspects of your medical health during a procedure, including blood pressure, diabetes, asthma, and heart conditions, while also administering the anesthetic itself.
Before surgery, the anesthesiologist reviews your health history, evaluates test results, and determines the safest anesthesia plan. During the procedure, they monitor your vital signs, manage any medical complications that arise, and administer fluids, blood products, and medications to keep your heart, lungs, and kidneys functioning properly. Their training prepares them to handle emergencies and patients with complex medical conditions.
How an Anesthesiologist’s Training Compares
The education pipeline for an anesthesiologist is long. After a four-year bachelor’s degree, they complete four years of medical school, four years of anesthesiology residency, and often an additional one to two years of fellowship training in a subspecialty like pediatrics, cardiac anesthesia, obstetrics, or pain management. That adds up to 12 to 14 years of post-secondary education. During residency and fellowship alone, an anesthesiologist accumulates between 12,000 and 16,000 hours of hands-on patient care.
A nurse anesthetist follows a shorter path. A registered nurse with a bachelor’s degree needs at least one year of critical care nursing experience before entering a 36-month graduate program in nurse anesthesia. During that program, a CRNA candidate completes roughly 2,500 clinical hours of anesthesia care. The total post-secondary timeline is around seven to eight years, roughly half that of an anesthesiologist.
What a Nurse Anesthetist (CRNA) Does
A certified registered nurse anesthetist is an advanced practice nurse, not a doctor. CRNAs administer anesthesia for surgeries and procedures, and in many settings they are the primary anesthesia provider, particularly in rural hospitals and outpatient surgical centers. They earn certification through the National Board of Certification and Recertification for Nurse Anesthetists (NBCRNA) by passing a national certification exam after completing their graduate program.
Whether a CRNA works independently or under a physician’s supervision depends on where they practice. As of 2024, 25 states and Guam have opted out of the federal requirement that CRNAs be supervised by a physician. In the remaining states, CRNAs typically work as part of a team led by a physician anesthesiologist.
The Anesthesia Care Team Model
Many hospitals use what’s called an Anesthesia Care Team, where a physician anesthesiologist leads a group that includes CRNAs and sometimes anesthesiologist assistants (CAAs). In this model, the anesthesiologist oversees multiple cases simultaneously, steps in for complex decisions or emergencies, and delegates routine monitoring tasks to the other team members.
Anesthesiologist assistants are a third, less well-known role. CAAs hold a master’s degree from a program housed within a medical school’s anesthesiology department, completing about 2,600 hours of clinical anesthesia training over 24 to 28 months. Unlike CRNAs, they are not nurses. They always work under the direct supervision of an anesthesiologist and cannot practice independently in any state.
Salary Differences
The pay gap between the two main roles reflects the difference in training length. Anesthesiologists are among the highest-paid physicians in the U.S., with median salaries typically exceeding $350,000 per year. Nurse anesthetists are also very well compensated: the Bureau of Labor Statistics reported a median annual salary of $212,650 for CRNAs in May 2023, making it one of the highest-paying nursing specialties.
What This Means for Your Care
If you’re heading into surgery, you may be cared for by an anesthesiologist, a CRNA, or both working together. In straightforward procedures on otherwise healthy patients, the practical difference in outcomes between the two providers is a subject of ongoing professional debate. Where the distinction matters most is in complex cases: patients with multiple chronic conditions, high-risk pregnancies, major cardiac surgery, or pediatric procedures. In those situations, the anesthesiologist’s deeper medical training and broader scope of practice become more relevant.
You can ask your surgeon’s office ahead of time who will be providing your anesthesia. If you have significant health conditions or concerns about your procedure, requesting that a physician anesthesiologist be involved in your care is reasonable and common.