If needed, the peak flow calculator can also count the diurnal variability for you. Normal peak flow variability shouldn't exceed 20%. If you measure your peak flow regularly, you should always do that at the same time of the day, as PEFR changes throughout the day. Peak expiratory flow...
DIURNAL VARIABILITY IN PEAK EXPIRATORY FLOW WITH TIOTROPIUM RESPIMAT IN ADULTS WITH SEVERE, MODERATE AND MILD SYMPTOMATIC ASTHMAHUW DAVIES, REN AALBERS, THOMAS CASALE, PETRA MORONI-ZENTGRAF, BENJAMIN VAN HECKE, RALF SIGMUND, HUIB KERSTJENS Respiratory Medicine, Repatriation General Hospital And Flinders...