Which Hemostasis Test Should I Order?

We know about the prothrombin time (PT) and the activated thromboplastin time (aPTT); but when should we get other specialized coagulation tests like the thrombin time? Hematologist, Dr. Onwuemene, discusses the tests you should consider when you are concerned about a disorder of primary hemostasis (platelet function) vs. a disorder of secondary hemostasis (coagulation).