<sod>Sometimes, to assess the reversibility of a particular condition, a [[bronchodilator]] is administered to counteract the effects of the bronchoconstrictor before repeating the spirometry tests. This is commonly referred to as a ''reversibility test'', or a ''post bronchodilator test'' (post BD), and may help in distinguishing asthma from [[chronic obstructive pulmonary disease]]. Also, a DLCO test can be used to distinguish asthma from COPD. <eod>
<sod>Sometimes, to assess the reversibility of a particular condition, a [[bronchodilator]] is administered to counteract the effects of the bronchoconstrictor before repeating the spirometry tests. This is commonly referred to as a ''reversibility test'', or a ''post bronchodilator test'' (post BD), and may help in distinguishing asthma from [[chronic obstructive pulmonary disease]]. Also, a [[DLCO|DLCO test]] can be used to distinguish asthma from COPD. <eod>