system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
For the diagnosis of obstructive airway disease which of the following is preferred
assistant
The correct answer is  In obstructive airway diseases fev1 is markedly reduced than FVC. Maximum mid expiratory flow rate(fev 25 -75 %) is the more sensitive measure of small airway obstruction.