A 51 year old man presents with spontaneous bleeding from his mouth for 2 days, along with passage of tarry black stools for a week. There is no history of epistaxis, hemoptysis, hematemesis, hematuria, or recent infection. He denies experiencing joint pain or tenderness. His medical and surgical histories are unremarkable and he is not on any drugs currently. There is no history of transfusion of blood or blood products. Nor is there a family history of bleeding disorders. He does not smoke, and is a life-long teetotaler.