Figure 1.
Current NICE criteria for an asthma diagnosis
Criteria to be applied in children with symptoms in keeping with asthma. Peak flow should be monitored for 2–4 weeks. More than 20% variability needed for positive test. For patients in whom asthma is suspected, after 6 weeks repeat abnormal tests and review symptoms. NICE=National Institute for Health and Care Excellence. FEV1:FVC=ratio of forced expiratory volume in 1 s and forced vital capacity. FeNO=fractional exhaled nitric oxide. PEF=peak expiratory flow. ppb=parts per billion. Figure adapted from NICE guidance for children.4