  The patient is an 80-year-old white female with history of atrial fibrillation, on Coumadin, who presented as outpatient, complaining of increasing fatigue.  CBC revealed microcytic anemia with hemoglobin of 8.9.  Stool dark brown, strongly OB positive.  The patient denied any shortness of breath.  No chest pain.  No GI complaints.  The patient was admitted to ABCD for further evaluation.