Asthma is the sickness with chronic inflammation of the bronchus. FENO test or Fractional Exhaled Nitric Oxide test in the asthma patient is another method to assess the inflammation of the bronchus to support the decision and to follow up the asthma treatment.
Upon inflammation of the respiratory system, the membrane cell of the bronchus shall produce the gas Nitric Oxide (NO) in higher quantity than the normal condition. The level of Nitric Oxide on exhalation or so-called Fractional Exhaled Nitric Oxide (FENO) is increased when the bronchus is inflamed in some circumstances i.e. Allergic Asthma, Eosinophillic Asthma.
FENO test is non-invasive, easy and could be done even in the serious patient or could not examine the lung condition (Spirometry). In addition, the test device is small and portable and could be used easily. The test receiver should use the mouthpiece and blow air out slowly with the fixed speed. The tool shall report the value of Nitric Oxide in ppb unit on the monitor.
The first class honors M.D., Faculty of Medicine, Thammasat University 2010