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FeNO testing, also known as Fractional Exhaled Nitric Oxide testing, is a simple breathing test used to measure inflammation in the airways. Elevated levels of nitric oxide in exhaled breath can indicate inflammation associated with allergic asthma.
At Certified Allergy & Asthma Consultants, FeNO testing helps evaluate patients throughout New York’s Capital Region who experience symptoms such as coughing, wheezing, shortness of breath, or persistent respiratory irritation.
This test provides valuable information about airway inflammation related to allergic or eosinophilic asthma and can help physicians determine whether inhaled corticosteroid medications or other treatments may be beneficial.
Because the test is quick, noninvasive, and performed in the office, FeNO testing can be an important tool for diagnosing and managing asthma.
FeNO testing measures the amount of nitric oxide gas present in a patient’s exhaled breath. Nitric oxide is produced naturally in the body, but higher levels in the breath can indicate inflammation in the airways.
Inflammation in the lungs is commonly seen in patients with allergic asthma and eosinophilic airway inflammation. Measuring FeNO levels provides physicians with additional information about the presence and severity of airway inflammation.
Unlike some lung function tests that measure airflow, FeNO testing focuses specifically on inflammatory activity in the airways.
FeNO testing may be recommended when evaluating respiratory symptoms or monitoring asthma treatment.
This test can help physicians:
FeNO testing is often used together with other diagnostic tools such as spirometry to provide a more complete picture of lung health.
FeNO testing is a quick and noninvasive procedure that is typically completed in just a few minutes.
The device measures the level of nitric oxide in the exhaled breath and provides an immediate result.
The procedure is painless and does not involve needles or medications.
Because the test requires controlled breathing, patients may be asked to repeat the maneuver to ensure accurate results.
FeNO results are measured in parts per billion (ppb) and help physicians evaluate the level of airway inflammation.
Higher FeNO levels may indicate significant airway inflammation commonly associated with uncontrolled allergic asthma.
Your allergist will interpret the results in combination with other clinical findings, symptoms, and diagnostic tests.
FeNO testing is primarily used in the evaluation and management of asthma and related airway inflammation.
Because airway inflammation can fluctuate over time, FeNO testing may be repeated periodically to monitor disease control.
FeNO testing requires minimal preparation. However, certain factors can influence test results.
Patients may be asked to:
Your care team will provide specific instructions if any preparation is necessary.
FeNO testing provides important information about airway inflammation that may not be detected through lung function testing alone.
When used together with other tests such as spirometry, FeNO testing helps physicians develop a more personalized approach to asthma care.
Patients trust Certified Allergy & Asthma Consultants for comprehensive evaluation of respiratory and allergic conditions.
With accurate testing and expert care, many patients can achieve improved asthma control and better long-term respiratory health.
