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
Alveolar-aerial gradient is increased in all except
assistant
The correct answer is  The normal alveolar aerial gradient is 5-15mmHg. In chronic bronchitis there is alveolar hypoventilation so alveolar aerial gradient is normal.