MPO and stroke disorder: By contrast, MPO serum levels steadily increased during the observation period, and differences with controls became significant from day 3 post-stroke (MPOd3(median [min-max]) 422 ng/ml [118–1952 ng/ml], MPOd5(median [min-max]) 441 ng/ml [101–1656 ng/ml] vs. MPOControl(median [min-max]) 115 ng/ml [13–1453 ng/ml]; p = 0.0176 (Fig. 1b).