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[A] The following conclusions are supported by good evidence:
Upper and lower gastrointestinal (GI) investigation (such as endoscopy, colonoscopy or radiological imaging) should be considered for men and postmenopausal women with confirmed IDA, and no obvious cause for their IDA.
A Cochrane systematic review of RCTs found that supplementing blood donors with iron (formulations, dosages and treatment durations were highly variable) helped decrease the rates of deferral from donating. Iron