You are evaluating a patient whom you suspect has asthma. You perform spirometry before and after administration of an inhaled short-acting bronchodilator. After administration of the bronchodilator, which of the following spirometry results would suggest reversibility?
1) An increase in forced expiratory volume in 1 second (FEV1) of at least 12% and 200 mL
2) A decrease in forced vital capacity (FVC) of at least 10%
3) A decrease in peak expiratory flow rate (PEFR) of at least 20%
4) No change in forced expiratory flow between 25% and 75% of forced vital capacity (FEF25-75)