| Abbreviation | Definition |
|---|---|
| ACLAD | American Committee on Laboratory Animal Diseases |
| ACLAM | American College of Laboratory Animal Medicine |
| ACMP | American College of Medical Physics |
| ACOL | Acceptable Carry-Over Limit |
| ACPE | Accreditation Council for Pharmacy Education |
| ACPM | American College of Preventive Medicine |
| ACR | American College of Radiology |
| ACRA | Associate Commissioner for Regulatory Affairs |
| ACRA(ORA) | Associate Commissioner for Regulatory Affairs (ORA) |
| ACRPI | Association of Clinical Research for the Pharmaceutical Industry |
| ACS | Automated Commercial System |
| ACS(CBER) | Analytical Chemistry Staff (Center for Biologics Evaluation and Research) |
| ACS(CDER) | Advisors and Consultants Staff (Center for Drug Evaluation and Research) |
| ACSM | American College of Sports Medicine |
| ACT | AIDS Clinical Trials |
| ACT | Applied Clinical Trials |
| ACTA | Access to COVID-19 Tools Accelerator |
| ACTB | Analytical Chemical Techniques Branch |
| ACTB(NCTR) | Analytical Chemical Techniques Branch (NCTR) |
| ACTH | AdrenoCorticoTropic Hormone |