| Abbreviation | Definition |
|---|---|
| ARD | Addiction Recovery of the Deaf |
| ARD | Assessment Reference Date |
| ARF | Addiction Research Foundation |
| ARH | Appalachian Regional Healthcare |
| ARI | Aberdeen (Scotland) Royal Infirmary |
| ARI | Aberdeen Royal Infirmary |
| ARI | Acute Respiratory Infection |
| ARISG | Adverse Reaction Information System Global |
| ARNP | Advanced Registered Nurse Practitioner |
| AROM | Artificial Rupture Of Membranes |
| ARPOB | Average Revenue per Occupied bed |
| ART | Active Release Technique |
| ARTH | Academy for Reiki Training and Healing |
| AS | Absence of Seizures |
| AS | Active Surveillance |
| AS | Adult Services |
| AS | Ambulatory Surgery |
| AS | Anabolic Steroid |
| AS | Associate Specialist |
| ASA | American Society of Anesthesiologists |