Which of the following is a characteristic of a red zone reading in asthma?

A red zone reading in asthma indicates a state of severe exacerbation, where the patient is experiencing significant difficulty in breathing and potentially serious airway obstruction. This condition often requires urgent medical intervention, which is why the indication for an immediate need for oral steroids is critical. Oral steroids are used to reduce inflammation in the airways, which helps to restore better airflow and alleviate symptoms during an asthma attack.

Patients in the red zone generally have a peak flow reading that is significantly lower than their personal best, reflecting inadequate control of asthma symptoms and a potential risk for worsening of their condition. In this context, recognizing the need for oral steroids as part of acute management highlights the urgency associated with the red zone, necessitating targeted treatment to prevent further deterioration.