MPO and collagenous colitis: Wagner’s study reported a higher level of myeloperoxidase in patients with collagenous colitis and lymphocytic colitis than in healthy control patients with the level 10.4 μg/g (10–90 percentile: 0.39–24.5 μg/g), 9.6 μg/g (10–90 percentile: 0.39–15.6 μg/g), and 4.9 μg/g (10–90 percentile: 0.53–12.4 μg/g), respectively [90].