FeNO Testing Advice

FeNO (fractional exhaled nitric oxide) is a test that measures the levels of nitric oxide in your breath. 

Before attending for your FENO test appointment please ensure the following: 

• Avoid eating, drinking (hot drinks, caffeine and alcohol) and smoking for at least 1 hour prior to your appointment 
• Avoid any significant exertion or exercise for at least 1 hour prior to your appointment 
• Avoid nitrate rich foods such as celery, leek, beetroot, lettuce, spinach or other green leafy vegetables, for at least 3 hours prior to your appointment. 

 Further information regarding your test can be found here. 

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