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α

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Alpha, the first letter of the Greek alphabet.

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Å

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angstrom unit.

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a

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

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ā

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[L.] ante, before.

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A2

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aortic second sound.

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a-

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SEE: 1an-.

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AA

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

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AAA

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

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AAb

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Autoantibody.

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AABB

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American Association of Blood Banks.

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AACC

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American Association for Clinical Chemistry.

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AACN

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

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AACVPR

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American Association of Cardiovascular and Pulmonary Rehabilitation.

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AAFP

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American Academy of Family Physicians.

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AAg

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Autoantigen.

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AAHN

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American Association for the History of Nursing.

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AAMA

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American Association of Medical Assistants.

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AAMI

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

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AAMS

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Association of Air Medical Services.

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AAMT

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American Association for Medical Transcription.

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AAN

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American Academy of Nursing.

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AANA

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American Association of Nurse Anesthetists.

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AANN

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American Association of Neuroscience Nurses.

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AANP

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American Academy of Nurse Practitioners.

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AAOHN

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American Association of Occupational Health Nurses.

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AAOMS

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American Association of Oral and Maxillofacial Surgeons.

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AAOS

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American Academy of Orthopedic Surgeons.

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AAP

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American Academy of Pediatrics; American Association of Pathologists.

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AAPA

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American Academy of Physician Assistants.

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AAPMR

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American Academy of Physical Medicine and Rehabilitation.

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a/A ratio

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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.

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AARC

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American ...

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