RT Journal Article SR Electronic T1 How to use the fractional exhaled nitric oxide test JF Archives of disease in childhood - Education & practice edition JO Arch Dis Child Educ Pract Ed FD BMJ Publishing Group Ltd and Royal College of Paediatrics and Child Health SP edpract-2019-318326 DO 10.1136/archdischild-2019-318326 A1 Rhiannon Hoggins A1 Madhavi Velpula A1 Susan Woodward A1 Mark Peter Tighe YR 2021 UL http://ep.bmj.com/content/early/2021/08/02/archdischild-2019-318326.abstract AB Measurement of fractional exhaled nitric oxide (FeNO) has become a mainstream, NICE-recommended, objective test of asthma severity. We explore the uses and practical issues with the FeNO test using clinically relevant questions for general paediatricians.