How To Evaluate a Prolonged PT and aPTT

What do you do when both the prothrombin time (PT) and activated partial thromboplastin time (aPTT) are prolonged? For starters, you think about what information the prolonged aPTT and the PTT give you about the coagulation cascade (Are you feeling anxious yet?). Hematologist, Dr. Toyosi Onwuemene, walks you through the evaluation.