sort by Rank | Alpha
| Possible Meanings | Rank |
| activated partial thromboplastin clotting times | ** |
| and plasma clotting times | ** |
| average pure tone hearing threshold | ** |
| activated partial prothrombin time | ** |
| activated partial thromboplastin clotting time | ** |
| activated partial thromboplastin systems | ** |
| activated partial thromboplastin time assay | ** |
| activated partial thromboplastin time test | ** |
| an increased partial thromboplastin time | ** |
| and partial prothrombin time | ** |
| plasma-activated partial prothromboplastin time | ** |
| ability to prolong the clotting time | ** |
| partial thromboplastin time test | ** |
| Activate Partial Thromboplastin Time | ** |
| a modified partial thromboplastin time test | ** |
| and phospholipid- dependent anticoagulant | ** |
| Act Partial Thromboplastin Time | ** |
| Activated Parital Thromboplastin Time | ** |
| Alabama Prospective Teacher Test | ** |
| Anti Piracy Training for Trainers | ** |
| Aktivovany Parcialni Tromboplastinovy Test | * |
| Activited Partial Thromboplastin Time | * |
| Aircraft Pilot Training Technology | * |
| Aktiveret Partiel Tromboplastin Tid | * |
| apollo part task trainer | * |
| Acquisition and Point Target Track | * |
| Advanced diamond-based Pressure & Temperature Transducers | * |