What action should be taken if the PEF reading falls in the red zone?

When a Peak Expiratory Flow (PEF) reading falls in the red zone, it indicates a significant reduction in airflow, suggesting that the individual's asthma is poorly controlled or potentially approaching a severe exacerbation. This level of concern requires immediate action, often signified by calling emergency services or taking other urgent measures to ensure the individual receives prompt medical attention.

In this context, calling 911 is crucial because it brings professional medical help directly to the person in distress. Timely intervention can prevent worsening symptoms that could lead to hospitalization or more severe complications.

The other options, while relevant in different situations, do not provide the immediate response necessary for a red zone reading. Continuing normal medication or increasing medications may delay critical care, and administering low-dose inhaled corticosteroids lacks the urgency needed in this scenario.