A test done to determine whether or not a person's bronchi are hyperresponsive. The subject breathes in air containing carefully controlled amounts of a substance known to cause bronchoconstriction. (Common substances used include methacholine, histamine, and vaporized salt water.) The bronchi of people with asthma respond to much smaller amounts of the substance than the bronchi of people who do not have asthma. This test is often used to confirm a diagnosis of asthma if there is uncertainty.
A test used to confirm an allergy to specific substance. A doctor will administer small but increasing amounts of a suspected allergen until an allergic response is noticed. Due to the risk of anaphylaxis, this should only be performed under a controlled setting.
Test to find out hypersensitivity of bronchi.