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Exhaled Nitric Oxide (eNO) Testing

Exhaled Nitric Oxide Testing

At UPMC Children’s Hospital of Pittsburgh, we believe parents and guardians can contribute to the success of this test and invite you to participate. Please read the following information to learn about the test and how you can help.

Fast Facts About eNO Testing

  • Exhaled Nitric Oxide (eNO) testing is a quick and easy way to measure inflammation (swelling) in the bronchial tubes of the lungs. 
  • The test may be done to diagnose asthma, to evaluate a chronic cough or to see how well inhaled corticosteroid treatment is working in a child who has already been diagnosed with asthma.
  • The test is done by having your child take a large breath and then breathe out very slowly into a tube connected to a computer. 
  • Your child will be asked to repeat the breaths several times to get an accurate measurement.
  • The eNO test takes a total of about 15 minutes. 
  • Your child may resume a normal diet and activities afterwards.