| Abbreviation | Definition |
|---|---|
| ACS | Augmentative Communication Service |
| ACT | Asthma Control Test |
| ACTAF | Association of Community Trusts and Foundations |
| ACTH | Adrenocortical stimulating Hormone |
| ACTOBAT | Australasian Clinical Trial Of Betamethasone And Thyroid |
| ACTOBAT | Australasian Clinical Trial Of Betamethasone And Thyroid-releasing-hormone for prevention of neonatal respiratory disease |
| ACTR | activin receptor |
| ACTR | Additional Cost of Teaching and Research???Scotland |
| ACTR | Additional Cost of Teaching and ResearchScotland |
| ACTR | Additional Cost of Teaching and Research–Scotland |
| ACTS | Agency for Community Team Support |
| ACTS | Auditory Comprehension Test for Sentences |
| ACU | Acute Care Unit |
| ACVPU | Alert Confusion Voice Pain Unresponsive |
| AD | abdominal diameter |
| AD | abdominal discomfort |
| AD | above diaphragm |
| AD | accident dispensary |
| AD | acetabular depth |
| AD | actinomycin D |