What is the purpose of spirometry in asthma diagnosis?

The purpose of spirometry in asthma diagnosis is to measure lung function and assess airflow limitation. This test provides quantitative data about how well a person's lungs are working by measuring the amount and speed of air that can be inhaled and exhaled. By evaluating key metrics, such as forced expiratory volume (FEV1) and forced vital capacity (FVC), healthcare providers can determine the presence and severity of airflow obstruction, which is a hallmark of asthma.

By identifying airflow limitations, spirometry helps to confirm an asthma diagnosis and guide treatment decisions. It can also assist in monitoring the effectiveness of asthma management plans over time. Accurate measurement of lung function is critical, as asthma can exhibit variability in symptoms and lung performance; therefore, spirometry is a vital tool in the proper assessment and management of the condition.