| APT | alum-precipitated toxoid; aminophenylthioether |
|---|---|
| APTA | American Physical Therapy Association |
| APTD | Aid to Permanently and Totally Disabled |
| APTF | American Physical Therapy Foundation |
| APTI | airway pressure time index |
| aPTT | activated Partial Thromboplastin Time |
| APTT, aPTT | activated partial thromboplastin time |