Frequently asked questions

Basic Definitions

Who are Certified Anesthesiologist Assistants (CAAs)?

Certified Anesthesiologist Assistants (CAAs) are highly skilled health professionals who work under the direction of licensed anesthesiologists to implement anesthesia care plans. CAAs work exclusively within the anesthesia care team environment as described by the American Society of Anesthesiologists (ASA). All CAAs possess a premedical background, a baccalaureate degree, and also complete a comprehensive didactic and clinical program at the graduate school level. CAAs are trained extensively in the delivery and maintenance of quality anesthesia care as well as advanced patient monitoring techniques. The goal of CAA education is to guide the transformation of qualified student applicants into competent health care practitioners who aspire to practice in the anesthesia care team.

Certified Anesthesiologist Assistants and certified registered nurse anesthetists are both defined as "non-physician anesthetists" within the Centers for Medicare & Medicaid Services section of the Code of Federal Regulations.

What is the origin of the Anesthesiologist Assistant profession?

In the 1960s, three anesthesiologists, Joachim S. Gravenstein, John E. Steinhaus, and Perry P. Volpitto, were concerned with the shortage of anesthesiologists in the country. These academic department chairs analyzed the spectrum of tasks required during anesthesia care. The tasks were individually evaluated based on the level of professional responsibility, required education and necessary technical skill. The result of this anesthesia workforce analysis was to introduce the concept of team care and to define a new mid-level anesthesia practitioner linked to a supervising anesthesiologist. This new professional - the Anesthesiologist Assistant or AA - had the potential to at least partially alleviate the shortage of anesthesiologists.

The new type of anesthetist would function in the same role as the nurse anesthetist under anesthesiologist direction. An innovative educational paradigm for anesthetists was created that built on a pre-med background during college and led to a Master's degree. This pathway placed AAs on an anesthesia "career ladder". Some AAs have leveraged their premed background, Master's degree and clinical experience to successfully apply to medical school. A few have returned to anesthesia to become the physician leader of the care team that launched their professional career.

The chairmen's vision became reality in 1969 when the first AA training programs began accepting students at Emory University in Atlanta, Georgia, and at Case Western Reserve University in Cleveland, Ohio.

What are the differences between CAAs and Physician Assistants?

Although CAAs and physician assistants (PAs) both function as physician extenders, they do not perform the same functions. Each has its own separate educational curriculum, standards for accreditation, and its own agency for certification. PAs receive a generalist education and may practice in many different fields under the supervision of a physician who is qualified and credentialed in that field.

An AA may not practice outside of the field of anesthesia or apart from the supervision of an anesthesiologist. A CAA may not practice as a physician's assistant unless the CAA has also completed a PA training program and passed the National Commission for the Certification of Physician Assistants (NCCPA) exam.

Likewise a PA may not identify him- or herself as a CAA unless he or she has completed an accredited AA program and passed the National Commission for the Certification of Anesthesiologist Assistants (NCCAA) exam. If also certified as a CAA, such a dual-credentialed PA would be required to practice as an anesthetist only as an extender for an anesthesiologist and could not provide anesthesia care at the direction of a physician of any other specialty.

What are the differences between Nurse Anesthetists (CRNAs) and CAAs?

Although both are considered to be equivalent clinical non-physician anesthesia providers and may serve as physician extenders in the delivery of anesthesia, CAAs and CRNAs are very different with regard to their educational background, training pathway and certification process.

Education and Certification

Where are AA education programs located?

There are 13 accredited AA educational programs.

  • Emory University - Atlanta, Georgia
  • Case Western Reserve University - Cleveland, Ohio
  • Case Western Reserve University - Houston, Texas
  • Case Western Reserve University - Washington, D.C.
  • South University - Savannah, Georgia
  • Nova Southeastern University - Fort Lauderdale, Florida
  • Nova Southeastern University - Tampa, Florida
  • University of Missouri-Kansas City - Kansas City, Missouri
  • Quinnipiac University - Hamden, Connecticut
  • University of Colorado - Aurora, Colorado
  • Medical College of Wisconsin - Milwaukee, Wisconsin
  • Indiana University - Indianapolis, Indiana
  • NEOMED College of Graduate Studies - Rootstown, Ohio

What are the requirements for sponsoring an AA program?

According to the latest standards established by the Commission on Accreditation of Allied Health Education Programs (CAAHEP), accredited Anesthesiologist Assistant educational programs must be supported by an anesthesiology department of a medical school that is accredited by the Liaison Committee on Medical Education or its equivalent. The anesthesiology department must have the educational resources internally or through educational affiliates that would qualify it to meet the criteria of the Accreditation Council for Graduate Medical Education (ACGME), or its equivalent for sponsorship of an anesthesiology residency program. CAAHEP rules also allow for consortium sponsorship utilizing the combined resources of an academic anesthesiology department and an accredited college with appropriate allied health faculty and degrees.

Although the standards recognize the importance of a basic science education within a clinically oriented academic setting, it is also recognized that some of the supervised clinical practice components of the curriculum may be carried out in affiliated community hospitals that have the appropriate affiliation agreements specifying the requisite teaching faculty and staffing ratios for the clinical experience.

What is the accrediting body for AA education programs?

The Commission on Accreditation of Allied Health Education Programs (CAAHEP) accredits AA training programs. ASA is a CAAHEP member and participates in the accreditation processes for three health professions - anesthesiologist assistant, respiratory therapy and emergency medical technician-paramedic. CAAHEP is the largest accreditor in the health sciences field. In collaboration with its Committees on Accreditation, CAAHEP reviews and accredits over 2000 educational programs in nineteen (19) health science occupations. CAAHEP is recognized by the Council for Higher Education Accreditation (CHEA).

CAAHEP re-approved the "Standards and Guidelines for Anesthesiologist Assistant Education" most recently in 2016. These standards are composed and submitted by the Accreditation Review Committee on Education for the Anesthesiologist Assistant (ARC-AA). ARC-AA in turn is composed of representatives from the American Academy of Anesthesiologist Assistants (AAAA), and the American Society of Anesthesiologists (ASA). Anesthesiologists from ASA work along with AA representatives from AAAA to define the educational process that produces a competent AA graduate. This partnership of professional organizations has ensured an integral role for anesthesiologists in AA education. This in turn echoes the anesthesiologist / AA relationship in the anesthesia care team.

Additional information on accreditation may be found at the CAAHEP website.

What is the length of the AA education program?

According to CAAHEP standards for AA programs, the depth and duration of the total program, and particularly the clinical experience, shall be sufficient to assure the potential employer that the newly graduated AA will be able to perform entry-level functions. The number, content and length of courses shall be appropriate to the training of an assistant to the anesthesiologist. The AA curriculum is based on an advanced graduate degree model, and at least two full academic years are required. The current programs are 24 to 28 months long. Graduates from all AA educational programs earn a masters-level degree.

What types of students enter AA education programs?

Qualified student applicants must possess a baccalaureate degree and complete all of the premedical course work required by the typical American medical school.

Though minor differences between programs may exist, generalized admission requirements for students seeking entrance into an AA program include:

  • Bachelor's degree from an accredited institution with a premedical sciences track
  • Two semesters of biology with laboratory
  • Two semesters of vertebrate anatomy and physiology (or other advanced biology) with laboratory
  • Two semesters of general chemistry; 1 semester of organic chemistry; a second semester of organic chemistry or biochemistry with laboratory
  • Two semesters of general physics with laboratory
  • Two semesters of advanced college mathematics including calculus
  • Either the Medical College Admissions Test (MCAT) or the Graduate Records Admission Test (GRE)

Who are the faculty of AA programs?

According to CAAHEP standards, the program must include faculty who are qualified through academic preparation and experience to teach assigned subjects. Faculty members for the basic sciences are university-based professors and instructors. Faculty for the supervised clinical practice portion of the educational program must include physicians and CAAs based within the department of anesthesiology, but also may include other health professionals who are experienced in their disciplines. Faculty members may possess clinical appointments within the affiliated medical school. Although anesthesiology residents and fellows may be involved in AA training, they should not play a predominant role.

What is the certification process for CAAs?

The National Commission for Certification of Anesthesiologist Assistants (NCCAA) was founded in July 1989, to develop and administer the certification process for AAs in the United States. The NCCAA consists of Commissioners representing ASA, AAAA, and at-large physician and AA members. Graduates or senior students in their last semester in an AA educational program that has been accredited by CAAHEP may apply for initial certification. Initial certification is awarded to an AA who has successfully completed the Certifying Examination for Anesthesiologist Assistants administered by NCCAA in collaboration with the National Board of Medical Examiners (NBME). Certified AAs are permitted to use the designation CAA to indicate that they are currently certified.

The content for the Certifying Examination for Anesthesiologist Assistants is based on knowledge and skills required for anesthetist practice. NCCAA has contracted with NBME to serve as a consultant for the development and ongoing administration of the Certifying Examination. A Test Committee of anesthesiologists and CAAs is responsible for writing and evaluating test questions for the examinations. The first Certifying Examination was administered in 1992.

NCCAA maintains a database of Anesthesiologist Assistants-Certified from which certification of individual practitioners can be verified. Hospitals, practice groups, state boards, and others can verify an AAs certification, including a printed verification statement, by going to the Verify Certification page of NCCAA's web site,

The web site also contains additional information about the National Commission and about the certification process.

Do CAAs have to recertify?

CAAs are granted a time-limited certificate after passing the initial examination. The ongoing process or recertification requires that CAAs submit documentation to NCCAA every two years that they have completed 40 hours of continuing medical education (CME). In addition, every six years they must pass the Examination for Continued Demonstration of Qualifications (CDQ).

CAA Practice

What does the ASA Care Team Statement say about CAAs?

According to the ASA statement on the Anesthesia Care Team, anesthesia care personally performed or medically directed by an anesthesiologist constitutes the practice of medicine. Certain aspects of anesthesia care may be delegated to other properly trained and credentialed professionals. These professionals, medically directed by the anesthesiologist, comprise the Anesthesia Care Team.

The Care Team statement (last amended on October 21,2009) says, "Such delegation should be specifically defined by the anesthesiologist and should also be consistent with state law or regulations and medical staff policy. Although selected tasks of overall anesthesia care may be delegated to qualified members of the Anesthesia Care Team, overall responsibility for the Anesthesia Care Team and the patients safety, rests with the anesthesiologist. Anesthesiologists should determine which perioperative tasks, if any, may be delegated. The anesthesiologist may delegate specific tasks to qualified non-anesthesiologist members of the ACT providing that quality of care and patient safety are not compromised, but should participate in critical parts of the anesthetic and remain immediately physically available for management of emergencies regardless of the type of anesthetic."

Members of the medically directed anesthesia care team may include anesthesiology residents as well as non-physicians such as anesthesiologist assistants and nurse anesthetists.

What is the scope of CAA clinical practice?

The scope of CAA clinical practice is generally the same as that of nurse anesthetists on the Anesthesia Care Team.

Specifically, the local scope of practice of CAAs is usually defined by:

  • The medically directing anesthesiologist,
  • The hospital credentialing body,
  • The state's board of medicine
  • Any applicable state statute or regulation.

States may also require a practice agreement between the sponsoring anesthesiologist and the CAAs who are medically directed.

What is the typical job description for CAAs?

The specific job descriptions and duties of CAAs may differ according to local practice. State law or board of medicine regulations or guidelines may further define the job descriptions of CAAs. The constant ingredient no matter what the local variation is that CAAs always practice under the medical direction of a qualified anesthesiologist.

As part of defining the educational goal of CAA training programs, the CAAHEP accreditation Standards include a template AA job description. The excerpt is included below. Wherever the term 'assisting' occurs, it is understood that such assistance may be actual performance of the stated task by the CAA as part of duties directed by the supervising anesthesiologist.

"Under the medical direction and supervision of an anesthesiologist, the CAAs functions include, but are not limited to, the following:

  • Making the initial approach to a patient of any age in any setting to obtain a preliminary preanesthetic health history, perform an appropriate preanesthetic physical examination and record pertinent data in an organized and legible manner for review by an anesthesiologist. These activities help to define the patient's current physical status as it relates to the planned anesthetic.
  • Performing or assisting in the conduct of diagnostic laboratory and related studies as appropriate, such as drawing arterial and venous blood samples.
  • Establishing noninvasive and invasive routine monitoring modalities as delegated by the responsible anesthesiologist.
  • Assisting in the application and interpretation of advanced monitoring techniques such as pulmonary artery catheterization, electroencephalographic spectral analysis, echocardiography and evoked potentials.
  • Assisting in inducing, maintaining and altering anesthesia levels, administering adjunctive treatment and providing continuity of anesthetic care into and during the postoperative recovery period.
  • Assisting in the use of advanced life support techniques such as high frequency ventilation and intra-arterial cardiovascular assist devices.
  • Assisting in making postanesthesia patient rounds by recording patient progress notes, compiling and recording case summaries and by transcribing standing and specific orders.
  • Performing evaluation and treatment procedures essential to responding to life-threatening situations, such as cardiopulmonary resuscitation, on the basis of established protocols (basic life support, advance cardiac life support, and pediatric advanced life support).
  • Assisting in the performance of duties in intensive care units, pain clinics and other settings, as appropriate.
  • Training and supervising personnel in the calibration, trouble shooting and use of patient monitors.
  • Performing delegated administrative duties in an anesthesiology practice or anesthesiology department in such areas as the management of personnel, supplies and devices.
  • Assisting in the clinical instruction of others."

The complete Standards for Accreditation of Anesthesiologist Assistant Education is available from CAAHEP at AA Standards.

Can CAAs perform regional anesthesia and place invasive monitors?

CAAs are permitted to perform regional anesthesia techniques and place invasive monitors. These aspects of CAA practice depend on the discretion of the supervising anesthesiologist, policies and procedures of the Department of Anesthesiology, standards set by the facility credentialing committee, and applicable state law. As always, performance of any such patient care task is under the medical direction of an anesthesiologist.

What is the legal authority for CAAs to practice?

Certified Anesthesiologist Assistants may be either licensed as CAAs or practice under the license of an anesthesiologist under the principle of delegation. Anesthesiologists may delegate those tasks or duties involved in the practice of anesthesiology to qualified individuals such as CAAs as long as the anesthesiologist is immediately available and the anesthesiologist retains ultimate responsibility for the care of the patient. The exact details regarding delegation and licensing of CAAs are different from state to state, and an anesthesiologist seeking to employ CAAs should consult the board of medicine of the state in which he or she practices.

Where do CAAs practice?

Anesthesiology practices in many states presently employ CAAs. Inclusion of CAAs in anesthesia care team practices across the country is a dynamic and evolving situation. To get the latest and most accurate information, please contact your state board of medicine or the ASA Washington Office for any questions on the licensure and practice locations of CAAs.

What is the difference between delegatory authority and licensure?

Licensure for CAAs is created by legislation that is enacted and codified into state law or through regulation adopted by the board of medicine.

Delegatory authority may take the form of either recognition and action by the board of medicine or expressed in a delegation enabling statute such as the state’s medical practice act. It is well accepted in various medical specialties, including anesthesiology, that the board of medicine may grant a physician the authority to delegate tasks or duties related to the practice of medicine to qualified individuals so long as the physician: 1) remains ultimately responsible to the patient and 2) assures that the individual performing the tasks is qualified to do so. An anesthesiologist seeking to employ CAAs under the principle of delegatory authority should seek input from the board of medicine of their specific state.

Licensure for CAA practice, although sometimes more difficult to achieve, better defines and anchors the practice of CAAs in a state than does the simpler delegatory authority.

In all states CAA practice falls under the auspices of the board of medicine. In contrast, nurse anesthetists' practice is regulated by state boards of nursing.

Practice Management of CAAs

Can I hire a CAA to work in my practice?

If your state does not presently provide the legislative or delegatory option of CAA practice, consultation should take place with the board of medicine or other governing body to explore the specific legal implications of CAA practice in your state. General information on the steps to establish CAA practice is available from the ASA's Office of Governmental and Legal Affairs. You may also inquire of other state societies as to their local advocacy and procedural steps that have led to gaining the option to hire CAAs.

Also, the American Academy of Anesthesiologist Assistants is a valuable resource on suggested methods of licensing and establishing practice of CAAs drawn from various states.

What is the anesthesiologist supervision ratio for CAAs?

In addition to the practical issues that limit how many anesthetists may be supervised by an anesthesiologist at any one time, ratios are also often specified as contract requirements from payors. For instance in order to meet CMS requirements for medical direction, no more than 4 anesthetists (CAAs or CRNAs) may be concurrently directed by an anesthesiologist.

The supervision ratio may also be defined in state law or Board of Medicine guidelines and is usually between 2:1 and 4:1. Check the regulations in your state for the applicable standard. It is important to note that in states where statutes specify a supervision ratio of CAAs to anesthesiologists at less than 4:1, the anesthesiologist may also concurrently supervise CRNAs up to a total combined ratio of 4:1 for both non-physician anesthetists.

How is CAA practice reimbursed by CMS and third-party payers?

CMS recognizes both CRNAs and CAAs as non-physician anesthesia providers. Similarly, commercial insurance payors make no distinction between the two anesthetist types with regard to payments for services provided under medical direction by an anesthesiologist.

According to the United States Code of Federal Regulations (42 C.F.R. § 482.52 Condition of participation: Anesthesia services)

"If the hospital furnishes anesthesia services, they must be provided in a well-organized manner under the direction of a qualified doctor of medicine or osteopathy. The service is responsible for all anesthesia administered in the hospital.

Standard: Organization and staffing. The organization of anesthesia services must be appropriate to the scope of the services offered. Anesthesia must be administered by only

  • A qualified anesthesiologist;
  • A doctor of medicine or osteopathy (other than an anesthesiologist);
  • A dentist, oral surgeon, or podiatrist who is qualified to administer anesthesia under State law;
  • A certified registered nurse anesthetist (CRNA), as defined in 410.69(b) of the Federal Register, who is under the supervision of the operating practitioner or of an anesthesiologist who is immediately available if needed; or
  • An anesthesiologist's assistant, as defined in 410.69(b) of the Federal Register, who is under the supervision of an anesthesiologist who is immediately available if needed."

How do CAA and CRNA salaries compare?

When employed within the same department and when possessing the same job description and experience level within the anesthesia care team, CAAs and CRNAs are compensated with identical salary and benefit packages.