20 May 2019 Measuring nitric oxide (NO) in exhaled air constitutes a non-invasive evaluation of bronchial inflammation . It is performed with a chemiluminescence analyser that quantifies NO with a simple exhalation. Nitric oxide levels in exhaled air are standardised. This is why it is possible to check therapeutic control, especially the need for steroid treatment. This test is particularly important in diagnosis of asthmatic children and young people and monitoring of their treatment. High levels of this marker compound are present in patients with uncontrolled bronchial asthma. This test is also useful in assessing patients with a prolonged cough that is of unknown cause or difficult to control. The results are not reliable in adult smokers. This test can be performed from the age of seven years. It is contraindicated in cases of recent abdominal or thoracic surgery. This article was written with the support of physicians and other clinical professionals from the Hospital da Luz network. The content published in the Health Guide is intended for the general public and is provided for informational and educational purposes only. It does not replace individual medical assessment, diagnosis, or personalized clinical advice from a qualified healthcare professional. The content is produced or reviewed by physicians and other healthcare professionals at Hospital da Luz and is based on the knowledge available at the time of publication or the most recent update, as indicated at the beginning of each item.
