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