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. |