What is FeNO Testing?

FeNO testing is a quick, non-invasive breath test that measures the amount of nitric oxide in your exhaled breath. Nitric oxide is a marker of inflammation in the airways, higher levels often indicate eosinophilic airway inflammation, which is commonly seen in asthma and other respiratory conditions.
The test takes only a few minutes and provides valuable information about how much inflammation is present in your lungs.

FeNO Testing

When is FeNO Testing recommended?

You have asthma symptoms and need help confirming the diagnosis.

Your doctor wants to check how well your asthma is controlled.

You are starting or changing inhaler treatment and need to see how it’s working.

You still have breathing problems even while on treatment.

It’s often done together with a lung function test (spirometry) to give a fuller picture of your lung health.

Symptoms that may indicate the need for a FeNO Test

Frequent wheezing or coughing

Shortness of breath or chest tightness

Symptoms that worsen at night or after exercise

Ongoing asthma symptoms despite using inhalers

Unexplained breathing difficulties or flare-ups

Why Choose Chequers Health

Consultant Led Care

Fast and Effective Services

Modern and Comfortable Setting with Ample Parking

Patients from Bolton, Bury, Manchester, Wigan and the Northwest choose Chequers Health for professional FeNO Testing.

Our Treatment Process

Consultant-Led Care, Guided by Best Clinical Practice

Self-Referral & Booking

Patients can self-refer online or by phone, choosing either self-pay or insurance to schedule their lung function test.

Test Appointment

The lung function test is carried out by a qualified respiratory physiologist and takes about 30–45 minutes to complete.

Report & Consultant Review

Results are analysed and reviewed by a respiratory consultant, who provides a detailed report and recommendations.

Affordable FeNO Testing

Self-Pay Prices

Full Lung Function Test £250

Spirometry £145

Feno £60

 Bronchodilator £100

Contact Us for More Information

If you are interested in learning more about how FeNO testing can improve your health or would like to inquire about other services, please don’t hesitate to contact us:

They are truly the best among all the centres offering a range of services, including intravenous iron infusions. The staff were exceptionally kind, professional, and genuinely caring — I felt completely comfortable and well looked after throughout my visit.

Marwa A

Our Consultants

Julie Chadwick
Julie Chadwick
Julie Chadwick is the Manager of the Respiratory Diagnostics Department at Bolton NHS Foundation Trust. In simple terms, she leads and oversees all aspects of the Respiratory Diagnostic Services, ensuring high-quality, safe, and effective care for patients with respiratory conditions.

Frequently Asked Questions

A Comprehensive Lung Health Assessment is a series of tests designed to evaluate how well your lungs are working. It helps detect early signs of lung disease, monitor existing conditions, and assess overall respiratory health, even if you’re not currently experiencing symptoms.

A specialist lung assessment provides valuable insights into both current lung function and future health risks.
It can:

  • Detect lung conditions before symptoms appear
  • Identify tumours or nodules in the lungs
  • Detect respiratory illnesses such as infections or emphysema
  • Evaluate the impact of previous illnesses, including COVID-19, on lung performance

Early detection allows for timely and more effective treatment.

The core test is spirometry which is a simple breathing test that measures how much air you can breathe in and out, and how quickly.
It helps identify airflow obstruction and detect early signs of conditions such as asthma, COPD, or occupational lung disease.

In addition to our standard assessments, we offer a range of specialised lung function tests to provide a full understanding of your respiratory health:

Spirometry Test – Measures how much air you can breathe in and out, and how quickly, helping to detect conditions such as asthma, COPD, and other airflow limitations.

FeNO Test (Fractional Exhaled Nitric Oxide) – A simple, non-invasive test that measures inflammation in the airways. It’s particularly useful for diagnosing and managing asthma and assessing how well your treatment is working.

Bronchodilator Reversibility Test – Performed after the initial spirometry test, this assesses how your lungs respond to inhaled medication. It helps determine whether your breathing difficulties are reversible, which is key for diagnosing conditions like asthma.

There is no prior prep just wear comfortable clothing. You can eat and drink beforehand but no or vigorous exercise.

Some tests use a spirometer, a device you breathe into (through a mouthpiece) that measure the amount of air and how quickly you’re able to inhale and exhale.

You will be asked to perform multiple attempts and you will wear a nose clip to ensure you breathe through your mouth.

Processed meats such as salami/ham, high oxidant foods like lettuce, berries, turnip tops/chervil are better to avoid. Similarly, anything with high caffeine content such as tea, coffee, and Coca-Cola. These items can affect the results of your lung function tests.

If you take a bronchodilator, please continue to use them as advised by your doctor. If you regularly use bronchodilators (Relievers such as Ventolin or Salbutamol, for example) please do not use them for a few hours before your appointment.

Avoid smoking for 1 hour before testing.

Notify your doctor if you’re pregnant or if you have abdominal swelling, both affect your ability to breathe deeply.

These tests are covered by some insurance provides but please check with your insurance beforehand.

You may feel faint or light-headed due to hyperventilation, but this will resolve in 15-45 minutes.