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α

Alpha, the first letter of the Greek alphabet.

Å

angstrom unit.

a

accommodation; ampere; anode; anterior; area; artery.

ā

[L.] ante, before.

A2

aortic second sound.

a-

SEE: 1an-.

AA

Achievement age; Alcoholics Anonymous; amino acid; arteriae; arteries.

AAA

abdominal aortic aneurysm; acne-associated arthritis; American Academy of Allergists; American Ambulance Association; American Association of Anatomists; Area Agency on Aging.

AAb

Autoantibody.

AABB

American Association of Blood Banks.

AACC

American Association for Clinical Chemistry.

AACN

American Association of Critical-Care Nurses; American Association of Colleges of Nursing.

AACVPR

American Association of Cardiovascular and Pulmonary Rehabilitation.

AAFP

American Academy of Family Physicians.

AAg

Autoantigen.

AAHN

American Association for the History of Nursing.

AAMA

American Association of Medical Assistants.

AAMI

Association for the Advancement of Medical Instrumentation; age-associated memory impairment.

AAMS

Association of Air Medical Services.

AAMT

American Association for Medical Transcription.

AAN

American Academy of Nursing.

AANA

American Association of Nurse Anesthetists.

AANN

American Association of Neuroscience Nurses.

AANP

American Academy of Nurse Practitioners.

AAOHN

American Association of Occupational Health Nurses.

AAOMS

American Association of Oral and Maxillofacial Surgeons.

AAOS

American Academy of Orthopedic Surgeons.

AAP

American Academy of Pediatrics; American Association of Pathologists.

AAPA

American Academy of Physician Assistants.

AAPMR

American Academy of Physical Medicine and Rehabilitation.

a/A ratio

The ratio of arterial oxygen partial pressure (a) to alveolar oxygen partial pressure (A). Under normal conditions, 90% or more of the partial pressure of oxygen in the lungs will diffuse into the blood yielding an a/A ratio greater than 0.9. This value can be used to determine whether there is a problem with gas diffusion.

AARC

American ...

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