| PT result | APTT result | Common condition present | 
|---|
Prolonged | Normal | Liver disease, decreased Vitamin K, decreased or defective factor VII | | Normal | Prolonged | Haemophilia A or B (decreased or defective factor VIII or IX) or factor XI deficiency, von Willebrand disease, factor XII deficiency, or lupus anticoagulant present | 
| Prolonged | Prolonged | Decreased or defective factor I (fibrinogen), II (prothrombin), V or X, severe liver disease, disseminated intravascular coagulation (DIC) | 
| Normal | Normal or slightly prolonged 
 | May indicate normal haemostasis; however, PT and PTT can be normal in conditions such as mild deficiencies in other factors and mild form of von Willebrand disease. Further testing may be required to diagnose these conditions. |