RT Journal Article SR Electronic T1 Impact of an increase in the inhaled corticosteroid dose on blood eosinophils in asthma JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 417 OP 418 DO 10.1136/thoraxjnl-2018-212233 VO 74 IS 4 A1 Marek Lommatzsch A1 Maria Klein A1 Paul Stoll A1 Johann Christian Virchow YR 2019 UL http://thorax.bmj.com/content/74/4/417.abstract AB Here, we report that increasing treatment with inhaled corticosteroids (ICS) in patients with not well-controlled asthma from a medium to a high dose results in a profound reduction of blood eosinophils (median fall in blood eosinophil concentrations from 560 to 320 cells/µL). Therefore, ‘normal values’ of blood eosinophils in patients with asthma need to be considered in view of the individual ICS doses of the patients. In addition, increases in the dose of ICS may result in blood eosinophil concentrations which would formally preclude treatment with biologics targeting the interleukin-5 pathway.