Ina patient with clinical signs of asthma which of the following tests will confirm the diagnosis
Demonstrated outflow obstruction.,: Decreased FEV1 Decreased PEF Decreased FEV1/FVC Ref Harrison 19th edition pg 1675
Increase in FEV1/FVC
>200 ml increase in FEV1 after Methacholine
Diurnal variation inPEF>20 %
Reduction of FEV1>20% after bronchodilators
Respiratory system