ModerateHaematologyIron deficiency anaemia (occult GI loss)uk-plab-1
A 56-year-old man with rheumatoid arthritis on long-term NSAIDs presents with fatigue and exertional breathlessness. FBC shows haemoglobin 98 g/L, MCV 74 fL and low ferritin. He also reports intermittent dark stools. What is the most appropriate initial investigation in addition to iron replacement?