| Abbreviation | Definition |
|---|---|
| AP | After Parturition |
| AP | Agony and Pain |
| AP | Angina Pectoris |
| AP | Anterior-Posterior |
| AP | AnteroPosterior |
| AP | Antibiotic Protocol |
| AP | Auscultation and Percussion |
| A-P | Anterior-Posterior |
| AP&L | AnteroPosterior and lateral |
| APA | Air Pathway Analysis |
| APA | Alkaline Phosphatase Activity |
| APA | Anti Polymer Antibody |
| APA | Anti-Polymer Antibody |
| APAB | Archives of Physiology And Biochemistry |
| APAC | Australian Psychology Accreditation Council |
| APACHE | Acute Physiology Age and Chronic Health Evaluation |
| APACHE | Acute Physiology Age Chronic Health Evaluation |
| APAP | Accelerated Physician Assistant Pathway |
| APAP | Acetaminophen |
| APB | Atrial Premature Beat |