Fractional nasal nitric oxide (FnNO) testing measures nitric oxide from the nose and sinuses during nasal breathing. Unlike FeNO, it reflects upper-airway biology. FnNO is non-invasive and changes with disease: often elevated in allergic ...
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FeNO testing is highly flow-dependent: exhaled flow rate determines which airway compartment is sampled. The standard 50 mL/s maneuver—a slow, steady exhalation against mild resistance for 6–10 seconds—primarily reflects large-airway b...
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Fractional exhaled nitric oxide, or FeNO, has a well-earned reputation in asthma. A patient breathes slowly into a handheld device, and within seconds a number appears in parts per billion—a non-invasive readout of type 2 airway inf...
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Asthma is one of the most common chronic respiratory conditions worldwide, yet diagnosing it has never been entirely straightforward. Unlike diabetes or hypertension, asthma has no single “gold standard” blood test or scan tha...
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For years, the Fractional Exhaled Nitric Oxide (FeNO) test has served as a valuable companion in the asthma clinician's toolkit, primarily guiding management decisions. The 2025 update to the Global Initiative for Asthma (GINA) guidelines...
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For decades, spirometry has been the cornerstone of lung function testing. A patient takes a deep breath and blasts it out as hard and fast as possible, and the numbers that emerge—FEV1, FVC, and their ratio—tell clinicians wh...
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By e-linkcare | Clinical Respiratory Insights Fractional exhaled nitric oxide (FeNO) testing is now widely recognized as a non-invasive biomarker of type 2 airway inflammation. It helps clinicians assess airway inflammation, predict corti...
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Abstract: Fractional exhaled nitric oxide (FeNO) has emerged as a critical, non-invasive biomarker for the assessment of airway inflammation, particularly eosinophilic inflammation. Its measurement plays a pivotal role in the diagnosis, p...
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A pulmonary function report tells you how well air moves in and out of the lungs. A FeNO result tells you something different: how much type 2–driven inflammation is likely present in the airways. When the two are read together, the...
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