Final answer:
The colors on a peak flow meter indicate zones of asthma control: the Green Zone (80%-100% of personal best) means good lung function, Yellow Zone (50%-79%) is a warning, and Red Zone (<50%) signifies a medical alert.
Step-by-step explanation:
The traffic signal colors on a peak flow meter are used to indicate the level of lung function in asthma management. The colors represent different zones of asthma control:
- Green Zone: This indicates 80%-100% of the person's personal best peak flow reading, signifying good lung function with no asthma symptoms.
- Yellow Zone: This indicates 50%-79% of the personal best, which is a warning sign that the asthma is getting worse or is not well-controlled.
- Red Zone: This indicates less than 50% of the personal best, signifying a medical alert that immediate action is needed to prevent a severe asthma episode.
These zones help individuals with asthma to monitor their condition and make decisions about their asthma management plan, such as when to take medication or seek medical attention.