Exhaled Nitric Oxide Test

An Exhaled Nitric Oxide (FeNO) test measures the level of nitric oxide gas in your breath, which can indicate inflammation in your airways, often related to asthma. During the test, you breathe into a device that analyzes the gas content. Elevated levels may suggest that your airways are inflamed and may help your healthcare provider diagnose asthma or assess how well your asthma treatment is working. It is a quick, non-invasive, and painless test used as part of managing respiratory conditions.