Anemia in an older man on NSAIDs: interpret the CBC, iron studies and blood film

Same patient: a 62-year-old man with 3 months of fatigue and exertional dyspnea who takes ibuprofen daily. His results are below. Interpret them, give the diagnosis and outline the management.

CBC: Hb 9.2 g/dL (male reference 13-17), MCV 71 fL (80-100), MCH 22 pg (low), RDW 18.5% (high), WBC 7.1 x10^9/L, platelets 320 x10^9/L. Reticulocyte index 0.8%.

Iron studies: serum iron low, ferritin 6 ng/mL (low), TIBC 470 microgram/dL (high), transferrin saturation 6% (low).

Peripheral blood film: small, pale (microcytic hypochromic) red cells with variation in size. No target cells, no basophilic stippling.