Interpretation of prothrombin time (PT) and activated partial thromboplastin time (aPTT).
| PT long; aPTT normal . | aPTT long; PT normal . | PT & aPTT long . |
|---|---|---|
| Adapted from reference 23. | ||
| Low Factor VII | Low Factor XII, XI | Low Factor V, X |
| Vitamin K deficiency | Low Factor VIII, IX | Low fibrinogen, prothrombin |
| Warfarin | Lupus anticoagulant | High hematocrit |
| Liver disease | Heparin | Vitamin K deficiency |
| Low prekallikrein/high | Warfarin | |
| molecular weight kininogen | Liver disease | |
| PT long; aPTT normal . | aPTT long; PT normal . | PT & aPTT long . |
|---|---|---|
| Adapted from reference 23. | ||
| Low Factor VII | Low Factor XII, XI | Low Factor V, X |
| Vitamin K deficiency | Low Factor VIII, IX | Low fibrinogen, prothrombin |
| Warfarin | Lupus anticoagulant | High hematocrit |
| Liver disease | Heparin | Vitamin K deficiency |
| Low prekallikrein/high | Warfarin | |
| molecular weight kininogen | Liver disease | |