Editing Spirometry (section)

===Supplemental diagnostics===
Spirometry can also be part of a [[bronchial challenge test]], used to determine [[bronchial]] hyperresponsiveness to either rigorous exercise, inhalation of cold/dry air, or with a pharmaceutical agent such as [[methacholine]] or [[histamine]].

To assess the reversibility of a particular condition, a [[bronchodilator]] can be administered before performing another round of tests for comparison. This is commonly referred to as a ''reversibility test'', or a ''[[post bronchodilator test]]'' (Post BD), and is an important part in diagnosing asthma versus COPD.

Other complementary lung functions tests include [[plethysmography]] and [[nitrogen washout]].