What PEF reading range indicates a 'green zone' in asthma management?

In asthma management, the 'green zone' represents an ideal range of peak expiratory flow (PEF) readings, indicating that the individual’s asthma is well-controlled and they are not experiencing any significant symptoms. A PEF reading in the range of 80-100% of the individual's personal best signifies that the patient is in good control of their asthma and can generally engage in normal activities without experiencing significant symptoms.

This range is critical because it serves as the baseline for asthma management and helps guide patients in recognizing when their condition is stable. When patients consistently have readings within this green zone, it indicates effective control of their asthma, minimizing the risk of exacerbations and complications.

The other ranges represent different levels of asthma control: readings between 50-80% usually indicate caution and the need for additional monitoring or intervention, while readings below 50% suggest significant compromise and likely require immediate medical attention. Thus, the 'green zone' is fundamentally important for patient reassurance and effective asthma management.