Problem: A 30-year-old female presents with a history of fatigue, dyspnea on exertion, gum bleeding, menorrhagia and ecchymoses for the last 2 weeks. She has a history of Crohn's disease and had a terminal ileum resection about 3 years ago. Labs reveal a Hgb 7g/dL, HCT 24%, reticulocyte count 0.5%, MCV 116, WBC 2.2 and platelets 45. Based on the above information, the most likely diagnosis is: