GSTM1 and inflammatory bowel disease: Another clinical practice study in IBD patients showed Hb levels normalization in up to 75% [20] of patients at last observation carried forward, with median Hb level ranging from 11.1 g/dL to 11.4 g/dL at baseline in the two study groups and post-treatment values ranging from 13.4 g/dL to 13.2 g/dL.