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# Reversibility of Airway Obstruction If obstruction is present, reversibility must be evaluated. * Done by performing spirometry before and after therapy. * Bronchodilator is administered by small-volume nebulizer or MDI. * Reversibility indicates effective therapy. * Reversibility is def...

# Reversibility of Airway Obstruction If obstruction is present, reversibility must be evaluated. * Done by performing spirometry before and after therapy. * Bronchodilator is administered by small-volume nebulizer or MDI. * Reversibility indicates effective therapy. * Reversibility is defined as 12% or greater improvement in FEV1 or FVC and at least 200-ml increase in FEV1.