A 48-year-old woman presents with tiredness and shortness of breath. Blood tests show Hb 9.0 g/dL, MCV 70 fL and low ferritin. She reports no menorrhagia. What is the most appropriate next step in management?AArrange urgent endoscopic investigation for possible gastrointestinal blood lossBStart oral iron and reassure without further investigationCArrange haemoglobin electrophoresis onlyDRefer to haematology for bone marrow biopsyERepeat full blood count in 6 months with no further action nowCheck my answer