What does exhaled nitric oxide testing primarily monitor?

Exhaled nitric oxide testing is primarily utilized to assess airway inflammation, particularly in patients with asthma. Nitric oxide is produced in the airways, and levels can increase in response to airway inflammation, which is commonly seen in asthmatic conditions. Therefore, measuring the concentration of exhaled nitric oxide serves as a valuable biomarker for monitoring the inflammation associated with asthma.

This test is especially beneficial for evaluating how well a patient is responding to inhaled corticosteroid therapy. When corticosteroids are effective, a reduction in airway inflammation typically leads to lower levels of exhaled nitric oxide. This correlation enables healthcare providers to customize treatment plans based on the individual’s response, allowing for more effective management of asthma.

In contrast, other options provided do not accurately reflect the primary use of exhaled nitric oxide testing. For instance, monitoring blood flow in the lungs pertains more to pulmonary hemodynamic assessments, heart function relates to cardiovascular evaluations, and airway resistance is typically measured using spirometry or other lung function tests. None of these options address the specific function of exhaled nitric oxide testing in the context of asthma and airway inflammation management.