In this study we have measured spontaneous and allergen induced basophil histamine release before and 24 hours after specific allergen bronchoprovocation challenge. Non-specific bronchial hyperreactivity was estimated twice: before and after allergen challenge. 15 atopic asthmatic entered the study. 8 of them developed only early asthmatic reaction and 7 demonstrated dual asthmatic reaction. In dual responders group higher values of spontaneous basophil histamine release before and increase of allergen induced basophil histamine release after specific allergen bronchoprovocation challenge were observed. There was an inverse correlation between values of allergen induced basophil histamine release and values of PC20 for histamine.
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