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Anatomy Respiratory system fe0fd9bc

Ina patient with clinical signs of asthma which of the following tests will confirm the diagnosis

A
Increase in FEV1/FVC
B
>200 ml increase in FEV1 after Methacholine
C
Diurnal variation inPEF>20 %
D
Reduction of FEV1>20% after bronchodilators
High-Yield Explanation
Demonstrated outflow obstruction.,: Decreased FEV1 Decreased PEF Decreased FEV1/FVC Ref Harrison 19th edition pg 1675

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