CRNAs and certified anesthesiologist assistants (CAAs) both give anesthesia, but they come from different professions. CRNAs are advanced practice nurses who can practice in every state, sometimes independently. CAAs work within anesthesiologist-led care teams, and only in the states that authorize them.
If you are deciding between the two, the biggest questions are your background, where you want to live, and how much independence you want.
Quick comparison
| CRNA | CAA | |
|---|---|---|
| Profession | Advanced practice registered nurse | Anesthesiologist assistant |
| Background before school | BSN or other accepted bachelor's, RN license, 1+ year of critical care nursing | Bachelor's degree; confirm prerequisites with each program |
| Entry degree | Doctorate (DNP or DNAP) | Master's level; confirm with programs |
| School length | 36 to 51 months | Confirm with programs |
| National exam | NBCRNA National Certification Examination (NCE) | NCCAA certification exam |
| Where you can practice | All states | Only states that authorize CAAs |
| Supervision | Varies by state, facility and payer; some practice without an anesthesiologist | Works within an anesthesiologist-led team |
| BLS pay data | Published separately (nurse anesthetists) | Not published separately |
Education and entry
CRNA
You need a bachelor's degree, a current RN license and at least one year of full-time critical care nursing. AANA says programs run 36 to 51 months, and all entry-level programs now award a doctorate. Most applicants spend 7 to 10 or more years getting from the start of a BSN to practice. See how to become a CRNA.
CAA
CAA programs do not require a nursing background or ICU work. Applicants usually come from a science or pre-medical track. Check prerequisites, length and degree type on each program's own site, since they differ.
The practical difference is time and experience. The CRNA route needs years of nursing first. The CAA route can start soon after college, but it locks you into a narrower set of states and practice models.
Where you can practice
CRNAs can practice in all 50 states. Rules on supervision vary. Medicare requires CRNA supervision by a physician unless a state opts out. As of September 2026, 27 states plus DC and Guam have opted out. See CRNA opt-out states.
CAAs can practice only in states that license or otherwise authorize them. That list has grown over time and still changes through state legislation. Check the current list with the American Academy of Anesthesiologist Assistants (AAAA) and confirm with the state medical board before you commit.
Supervision and scope
CRNAs work in many models: in a care team with anesthesiologists, under a surgeon's supervision, or without physician supervision in opt-out states. AANA says CRNAs provide more than 80% of anesthesia in rural counties, and half of US rural hospitals use a CRNA-only model for obstetric care.
CAAs work as part of an anesthesiologist-led care team. If you want the option to practice on your own or in rural hospitals without anesthesiologists, the CRNA path gives you more options.
Pay
The BLS reports pay for nurse anesthetists separately. In May 2025, the median was $236,590 and the mean was $248,320. See CRNA salary.
The BLS does not publish separate pay for anesthesiologist assistants. Its Occupational Outlook Handbook points readers from "anesthesiologist assistant" to the physician assistants page. That means any CAA salary figure you see comes from surveys or employers, so check the source.
Job outlook
The BLS projects nurse anesthetist employment to grow 10% from 2025 to 2035, from 54,500 to 59,800 jobs. It does not publish a separate projection for CAAs.
Which path should you choose?
The CRNA path may suit you if:
- You are already a nurse, or want nursing as a career base
- You want to be able to work in any state
- You value independent practice or rural work
The CAA path may suit you if:
- You have a science background and do not want to become a nurse first
- You plan to live in a state that authorizes CAAs
- You prefer working within an anesthesiologist-led team
Talk to people in both roles. Shadow a CRNA and a CAA if you can, and ask what they wish they had known.
FAQ
Can a CAA become a CRNA?
Only by going through nursing school, becoming an RN, gaining ICU experience and completing a nurse anesthesia program. There is no direct bridge.
Can a CRNA work as a CAA?
They are separate credentials. A CRNA would need to meet CAA program and certification requirements.
Which is harder to get into?
Both are competitive. CRNA programs also require you to be an experienced ICU nurse. See CRNA school acceptance rates.
Sources
- AANA: CRNA fact sheet
- AANA: Fact sheet concerning state opt-outs (September 2026)
- BLS Occupational Outlook Handbook: Nurse anesthetists, nurse midwives and nurse practitioners
- BLS Occupational Outlook Handbook: A-Z index (anesthesiologist assistant)
- BLS Occupational Employment and Wage Statistics (May 2025)
- NBCRNA: Certification for students