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Test for asthma

Fractional Exhaled Nitric Oxide (FeNO) test

Using the FeNO test to measure the level of nitric oxide in your lungs can give an indication of asthma

About

A FeNO test is a quick and easy way to measure swelling in the bronchial tubes (airways) of the lungs. The test may be done to diagnose asthma, check on chronic cough, or to see how well inhaled corticosteroid (ICS) treatment is working if you have already been diagnosed with asthma.

Need to know

  • What happens icon plus

    - You'll be asked to sit down for the test. - You'll be asked to breath in as fully as possible and blow out at a steady pace for about 10 seconds. - The test normally takes about 5 minutes.
  • How to prepare icon plus

    No preparation is required before your FeNO test.
  • Afterwards icon plus

    You'll be able to resume your normal routine immediately following your FeNO test.
Consultant in theatres

Our consultants

We're proud to work with leading experts across a range of medical fields, whose skills are matched by their integrity and compassion.

Our facilities

From complex surgery to straightforward procedures, we provide exceptional care across our network of hospitals, outpatient centres and specialist clinics.

  • Wellington-south-hero-facility-582-582

    The Wellington Hospital

    Wellington Place

    London NW8 9LE

    Appointments 0207 483 5148
    Enquiries 020 3131 7478

  • London Bridge Hospital Facility

    London Bridge Hospital

    27 Tooley Street

    London

    SE1 2PR

    Appointments and Enquiries 020 7234 2009
    Imaging Appointments 020 7234 2773
    Switchboard 020 7407 3100

  • facility-HSC-flag-hero-582x582

    The Harley Street Clinic

    35 Weymouth Street

    London

    W1G 8BJ

    Appointments 020 7034 8181
    Enquiries 020 3131 7962

  • The Lister Hospital Facility

    The Lister Hospital

    Chelsea Bridge Road

    London

    SW1W 8RH

    Appointments 020 7811 4000
    Enquiries 020 3131 4978

  • The Portland Hospital Facility

    The Portland Hospital

    205 - 209 Great Portland Street

    London

    W1W 5AH

    Children's enquiries 020 7390 8020
    Maternity enquiries 020 7390 6068
    Gynaecology enquiries 020 7390 6200

Request an appointment

We're happy to help you make an appointment with one of our experienced consultants.

This content is intended for general information only and does not replace the need for personal advice from a qualified health professional.
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