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Full lung function test

Pulmonary function test

A breathing test that measures how well your lungs are working

About

A lung function test measures how well your lungs are functioning. Your consultant may request this test to check if you have lung disease, measure the severity of lung disease, to see if medication will improve your breathing or to test your lung function before a procedure.

Need to know

  • What happens icon plus

    You will be asked to sit down and breathe into a machine through a mouthpiece. A nose clip will be used to seal your nose. Your consultant will then test three different things. First they will ask you to blow air out of your lungs as quickly and for as long as you can to check the speed at which you can breathe out. You will then need to breathe in until you feel full and hold your breath. This checks how well oxygen travels through your lungs into your blood. Lastly you will need to sit in a sealed, clear box so your consultant can check the volume of air in your lungs. Changes in pressure inside the box help to determine your lung volume.
  • How to prepare icon plus

    You should allow one hour for your test and bring along a list of medications that you are taking. You should avoid eating a heavy meal, drinking alcohol, exercise and smoking directly before your test. Wear loose fitting clothing that do not restrict your breathing.
  • Afterwards icon plus

    You will be able to go home and carry on with your day as normal. You will need to book a follow-up appointment with your consultant to go through the results.
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.

  • 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

  • The Lister Hospital Facility

    The Lister Hospital

    Chelsea Bridge Road

    London

    SW1W 8RH

    Appointments 020 7811 4000
    Enquiries 020 3131 4978

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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