Final answer:
The peak flow rate of a patient with well-controlled asthma is in the green zone, reflecting 80-100% of the patient's personal best and indicating stable breathing.
Step-by-step explanation:
If the patient has good control of her asthma, her peak flow rate is in the green zone. The peak flow rate is a measure of how well air moves out of the lungs. In individuals with asthma, this measurement helps track how well the lungs are functioning. A peak flow meter, which is the device used to measure this rate, typically has a color-coded system where the green zone represents 80-100% of the patient's personal best peak flow rate, indicating good asthma control. If a person's readings frequently fall within this range, it demonstrates that their breathing is stable and the condition is well-managed. Conversely, readings in the yellow zone (50-79% of personal best) suggest caution and a potential need for adjustments in medication or management. Readings in the red zone (below 50% of personal best) signal a medical emergency and require immediate action. It is essential for asthma patients to regularly monitor their peak flow rate to avoid exacerbation of symptoms and to manage their condition effectively.