Abstract
The inhalation test is a valuable investigation method in diagnosis of bronchial asthma. It can be carried out simply and safely, its results being superior to those of skin tests. Observations based upon 1070 inhalation tests in 200 asthmatics showed that dermal sensitivity corresponds to pulmonary sensitivity only in ⅓ of cases with positive skin tests. However, in presence of strong skin reactions the incidence of positive inhalation tests is high. Milder skin reactions are less valuable in selection of allergens for performance of inhalation tests. The highest coincidence in positive skin and pulmonary reactions was found in tests with animal hair extracts. In cases of negative skin test the allergen concerned may induce a positive inhalation test in approximately 21 per cent.