Patterns of coagulation results; possible diagnoses
| Test results | Possible diagnosis |
|---|---|
| *von Willebrand disease subtype 2B is associated with reduced platelets; aPTT is not always prolonged. | |
| Prolonged aPTT | von Willebrand disease* |
| PT/fibrinogen/platelets normal | Factor VIII deficiency |
| Factor IX deficiency | |
| Factor XI deficiency | |
| Prolonged PT | Warfarin ingestion |
| aPTT/fibrinogen/platelets | Early vitamin K deficiency |
| normal | Early liver dysfunction |
| Factor VII deficiency | |
| Prolonged PT and aPTT | Over warfarinisation |
| Fibrinogen/platelets normal | Severe vitamin K deficiency |
| Over heparinisation | |
| Factor X, factor V, or prothrombin deficiency | |
| Acquired inhibitors | |
| Prolonged PT and aPTT | Severe liver dysfunction |
| Decreased fibrinogen Normal or low platelets | Dysfibrinogenaemia/afibrinogenaemia |
| Disseminated intravascular coagulation (including meningococcal sepsis) | |