Important Safety Information | NIOX VERO® User Manual (PDF)

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Nasal Nitric Oxide

Say hello to nNO

NIOX® performing an nNO test

What is nNO?

nNO stands for nasal nitric oxide and is naturally produced in high quantities in the nasal cavity. Levels of nNO can be drastically reduced in some conditions, such as PCD (primary ciliary dyskinesia), therefore testing nNO can be a helpful tool to assist with diagnosis.

Why use NIOX® for nNO?

Did you know that the gold standard FeNO device NIOX VERO® can also be used for nNO testing?

With NIOX VERO®, testing nasal nitric oxide is simple. As the only portable device that can measure nNO, NIOX offers an all-in-one experience for your practice.

How does it work?

With two testing methods, tidal breathing or expiration against resistance, patients over the age of 5 can simply measure nNO using NIOX VERO®.

The device gently samples air from the patient's nasal cavity, making measuring nNO comfortable for most patients.

The NIOX® Panel app allows you to track nNO levels in real time.

One device, two
cutting-edge technologies

Get started with NIOX VERO®

Join the thousands of healthcare professionals who have already performed over 40 million FeNO tests with NIOX®, and improve patient outcomes.


1. Menzies-Gow A et al. Clinical utility of fractional exhaled nitric oxide in severe asthma management. Eur Respir J. 2020;55(3):1901633. 2. Dweik RA et al. An official ATS clinical practice guideline: interpretation of exhaled nitric oxide levels (FeNO) for clinical applications. Am J Respir Crit Care Med. 2011;184(5):602-15. 3. Heaney LG et al. Eosinophilic and noneosinophilic asthma: an expert consensus framework to characterize phenotypes in a global real-life severe asthma cohort. Chest. 2021;160(3):814-30. 4. Munakata M. Exhaled nitric oxide (FeNO) as a non-invasive marker of airway inflammation. Allergol Int. 2012;61(3):365-72.