| Abbreviation | Definition |
|---|---|
| A | Anaphylaxis |
| A&E | Accident Emergency |
| A&E | Accident Emergency (UK) |
| A&E | Accident & Emergency |
| A&E | Accident & Emergency (UK) |
| A&E | accident and emergency |
| A&O | Alert and Oriented |
| A.M | Alternative Medicine |
| A.T.S. | anti-tetanus serum |
| A/OX | Alert and Oriented Times 3 |
| AA | Absolute Alcohol |
| AA | Application As |
| AAA | Appropriate, Affordable, and Available |
| AAA | Arrest After Arrival |
| AAAASF | American Association for Accreditation of Ambulatory Surgery Facilities |
| AAAGH | Aruna Asaf Ali Govt Hospital |
| AAC | Advisory Appointments Committee |
| AAEH | Asean Association of Eye Hospitals |
| AAEMPG | American Academy of Emergency Medicine Physician Group |
| AAFH | Addis Ababa Fistula Hospital |