Which device is commonly used to diagnose asthma?

The peak flow meter is a valuable tool commonly used in the management and diagnosis of asthma. This handheld device measures a patient's peak expiratory flow rate (PEFR), which reflects how quickly they can expel air from their lungs. By monitoring this measurement, healthcare providers can assess lung function and determine how well asthma is managed. If a patient’s peak flow rate is significantly lower than their personal best, it may indicate worsening asthma control or an impending attack.

The peak flow meter is particularly useful because it can easily be used at home, allowing patients to track their lung function regularly and make informed decisions regarding their asthma management. It provides immediate feedback, empowering patients to recognize when their asthma is not well controlled.

While the spirometer is also used to assess lung function and diagnose respiratory conditions, it is generally performed in a clinical setting and provides more comprehensive measurements than the peak flow meter. In contrast, devices like the blood pressure cuff and electrocardiogram do not have a direct role in diagnosing asthma, as they assess different physiological parameters.