| API | alkaline protease inhibitor; Analytical Profile Index; arterial pressure index; atmospheric pressure ionization; Autonomy Preference Index |
|---|---|
| APIC | Association for Practitioners in Infection Control |
| APIE | assessment, plan, implementation, and evaluation |
| APIM | Association Professionnelle Internationale des Medecins |
| APIP | additional personal injury protection |
| APIVR | artificial pacemaker-induced ventricular rhythm |