[The information content of bronchial reactivity tests (acetylcholinetest) for screening purposes]

It is described a methodology of the test of bronchial reactivity (acetyl choline test) in the area of occupational medicine. Experiments of retesting resulted in a good reproducibility without regard to the fact that the problems of aerosol dosage and retention are not exactly to be clarified at present. Concerning the information value of tests of bronchial reactivity their value in early diagnosis is emphasized compared with the spirometry without provocation. As essential factors of influence for the results of the tests proved to be the eventually existing diseases of the respiratory tract and the ventilatory initial values. Habits of smoking and age are of less influence.