What test should be performed next to get closer to a diagno…

What test should be performed next to get closer to a diagnosis for an adult female patient with bleeding symptoms and the following results?   TEST   RESULT   REFERENCE INTERVAL     Platelet Count   240,000/uL   150,000 – 450,000/uL     PT   23.4 seconds   10.5 – 13.5 seconds     aPTT   59.5 seconds   25.0 – 35.0 seconds     Thrombin Time   43.4 seconds   10.0 – 22.0 seconds     Platelet Aggregation Studies Normal curves with: ADP, EPI, Collagen, Ristocetin  Normal Curves     Mixing Studies (PT)   Corrected   NA     Mixing Studies (aPTT)   Corrected   NA

A patient with bleeding symptoms presents to the emergency r…

A patient with bleeding symptoms presents to the emergency room and the following results are obtained. The patient reports that they are not currently taking any anticoagulant drugs. Which test would be most helpful to perform next?   TEST   RESULT   REFERENCE INTERVAL     Platelet Count   321,000/uL   150,000 – 450,000/uL     PT   17.8 seconds   10.5 – 13.5 seconds     aPTT   27.8 seconds   25.0 – 35.0 seconds