What is the FEV1 ratio range for moderate persistent asthma?

What is the FEV1 ratio range for moderate persistent asthma?

• A. 60-80%
• B. 80-100%
• C. 40-60%
• D. <40%

Answer: (A)

The main idea is that asthma severity is linked to how much airflow remains limited, as shown by FEV1 percent predicted after a bronchodilator. In moderate persistent asthma, the FEV1 is about 60% to 80% of what’s predicted for the person’s age, height, and sex. This reflects a clear but not severe reduction in expiratory airflow. Values ≥80% are typically seen with mild intermittent or mild persistent asthma, while values below 60% indicate more severe obstruction. So 60–80% best fits moderate persistent asthma.

The main idea is that asthma severity is linked to how much airflow remains limited, as shown by FEV1 percent predicted after a bronchodilator. In moderate persistent asthma, the FEV1 is about 60% to 80% of what’s predicted for the person’s age, height, and sex. This reflects a clear but not severe reduction in expiratory airflow. Values ≥80% are typically seen with mild intermittent or mild persistent asthma, while values below 60% indicate more severe obstruction. So 60–80% best fits moderate persistent asthma.