This website is for healthcare professionals

Case study: Diagnosis

Ruling Out Asthma with FeNO Testing in a Complex Case

A teenage girl with a history of classic asthma symptoms was referred for further evaluation after not responding to asthma treatment. FeNO testing played an important role in ruling out asthma and preventing unnecessary medication escalation.

Last updated: September 2026

Patient profile

Gender/Age: Female, teenager
History:Multiple hospital admissions for acute asthma exacerbations and one suspected case of anaphylaxis, complex mental health issues

Symptoms

  • Cough
  • Wheeze
  • Chest tightness
  • Shortness of breath

Challenges and Diagnostic Approach:

The patient had been nebulised and treated with oral corticosteroids during hospital admissions. Despite being started on inhaled corticosteroids (ICS), she showed no improvement, which raised concerns about the asthma diagnosis.

She had been stepped up to combination therapy (ICS-LABA), but still had no response. However, she reported that her blue inhaler (short-acting bronchodilator) was helpful, indicating a possible bronchodilator response.

Spirometry: Normal, even on a symptomatic day when readings were expected to be abnormal. The patient’s effort during spirometry was inconsistent, but after multiple attempts, the results suggested normal lung function.

Serial Peak Flow: No significant variability typical of asthma, though there were concerns about the accuracy of the readings as the patient had trouble completing the chart consistently.

The combination of normal spirometry, lack of peak flow variability, and very low FeNO indicated that asthma was not the correct diagnosis, despite her classic asthma-like symptoms. This allowed her healthcare team to stop escalating asthma treatments, which were not helping, and consider alternative diagnoses and treatment approaches.

FeNO Test: 8 ppb on a bad symptomatic day, a very low level, indicating no eosinophilic inflammation and ruling out asthma as the cause of her symptoms.

Outcome:

  • The patient avoided unnecessary increases in asthma medications, including high-dose inhaled corticosteroids, which would not have addressed the root cause of her symptoms. A new treatment plan was developed that focused on non-asthma-related causes of her symptoms.

Clinical Takeaway:

FeNO testing, combined with spirometry and peak flow, provided critical evidence to rule out asthma in a patient who presented with classic symptoms but showed no response to treatment. This approach prevented unnecessary treatment and guided the patient toward a more appropriate management plan for her condition.

Ready for FeNO by NIOX®?

Request a quote for a device today with our simple and easy to use quotation tool. Used by thousands of healthcare professionals, NIOX® is the global device of choice for FeNO testing.

Request a Quote

Discover FeNO Testing

Learn about FeNO with our free app

Why NIOX®

Explore the Gold Standard device

Understand FeNO Scores

Use our interpreting FeNO calculator

NIOX® Customer Support and Training

At NIOX® we are passionate about providing excellent support and training.

© Copyright NIOX Group plc. MKT-PRM-WW-0089. May 2024.