Forced Expiratory Volume Fev

Overview

Forced expiratory volume (FEV) is a measurement of how much air you can blow out of your lungs, and how fast. It comes from a breathing test called spirometry (say: spy-rom-uh-tree). You take the deepest breath you can, then blow out as hard and as fast as you can into a tube connected to a small machine. The machine records the air you push out. The most common number is FEV1, which is the amount of air you blow out in the first second. Your result is compared with what is expected for someone of your age, height and sex. FEV is not a disease. It is a number that helps your doctor understand how your lungs are working and whether something is making your airways narrow.

Yes. Spirometry is one of the most common lung tests in general practice and hospital clinics. Millions of these tests are done every year around the world, for everything from a routine asthma check to assessing a long-term cough.

Anyone can have their FEV measured. It is most often done for people with ongoing breathlessness, a cough that will not go away, wheezing, chest tightness, or a known lung condition such as asthma or COPD (chronic obstructive pulmonary disease, a long-term lung condition that makes breathing harder). It is also used to monitor people exposed to dust or fumes at work, and to check lung health in conditions like cystic fibrosis. Children can usually do the test from about five or six years old, once they can follow instructions and blow hard enough.

Symptoms

Common symptoms

• Breathlessness during everyday activities, or when exercising
• A cough that lasts more than a few weeks
• Wheezing (a whistling sound when you breathe)
• Chest tightness or a feeling of not being able to get enough air
• Coughing up mucus or phlegm
• Chest infections that keep coming back
• Feeling more tired than usual, or tiring quickly with activity
• Waking at night because of breathing problems

Symptoms in children

• Wheezing or a cough that comes back often, especially with colds or exercise
• Breathlessness that limits play or sport
• Chest infections that are frequent or slow to clear
• A cough that is worse at night or early in the morning
• Poor weight gain or slower growth in some long-term lung conditions
• Needing help and practice to do the breathing test well — children often need several tries, and that is normal

Symptoms in older adults

• Breathlessness that is put down to 'just getting older' when it may be worth checking
• Breathlessness when walking uphill, climbing stairs or carrying shopping
• A cough or wheeze that has been present for months
• Tiring more easily, or needing to stop and rest during activities
• Difficulty performing the test with full force because of arthritis, frailty or tiredness — the team can adapt how the test is done
• Several health conditions at once, which can make it harder to tell what is causing the breathing problem

Causes

Main causes

• Asthma — inflamed, sensitive airways that narrow in response to triggers
• COPD — long-term damage to the airways and air sacs, most often linked to smoking
• Cigarette smoking, past or present, which damages lung tissue over time
• Cystic fibrosis and bronchiectasis — conditions where mucus builds up and airways become damaged
• Interstitial lung disease — scarring or inflammation of the lung tissue itself
• Chest wall or muscle problems that make it harder to move air in and out
• Being very overweight, which can reduce how much air you can move
• Heart conditions that cause fluid to build up and make breathing harder
• Poor test technique — not sealing your lips around the mouthpiece or not blowing hard enough can give a falsely low number, which is why tests are usually repeated

Risk factors

• Smoking, including long-term exposure to other people's smoke
• Working with dust, fumes, chemicals or asbestos without good protection
• Living in an area with high air pollution
• Frequent chest infections, especially in childhood
• Allergies, eczema or a family history of asthma
• Being born prematurely, which can affect lung growth
• Family history of lung disease, such as cystic fibrosis or COPD
• Being overweight or inactive, which affects breathing effort and fitness

When to see a doctor

See a doctor urgently if:

• Breathlessness that is new, quickly getting worse, or happens at rest
• Chest pain with difficulty breathing
• Coughing up blood
• A flare-up of a known lung condition that is not responding to your agreed action plan
• Fever with a worsening cough or breathlessness
• Lips or fingertips looking blue or grey — call emergency services straight away

Book a routine appointment if:

• A cough that has lasted more than three weeks
• Breathlessness that is limiting your normal activities or exercise
• Wheezing that comes and goes, especially with colds, exercise or at night
• Chest infections that keep returning
• You want to understand your spirometry results or an FEV1 number you have been given
• You have a long-term lung condition and it is time for a review

Diagnosis

FEV is measured with spirometry, a simple, painless breathing test that takes about 15 to 20 minutes. You sit down, put a clip on your nose, and breathe into a mouthpiece attached to a machine. You will be asked to breathe normally a few times, take a very deep breath in, then blow out as hard and as fast as you can until your lungs feel empty. You usually repeat this at least three times so the best effort can be used. Sometimes you then take a puff of an airway-opening medicine and repeat the test to see if your numbers improve. The results are compared with expected values based on your age, height, sex and ethnicity.

Tests that may be done

• Spirometry — the breathing test that gives your FEV1 and FVC numbers
• Bronchodilator response test — spirometry repeated after an airway-opening inhaler to see if your FEV1 improves
• Peak flow diary — a small handheld meter you blow into at home, morning and evening, over days or weeks
• FeNO test — a gentle breath test that checks for inflammation in the airways
• Full lung function tests — more detailed testing that measures lung size and how well oxygen crosses into your blood
• Chest X-ray or CT scan — pictures of the lungs to look for other causes
• Blood tests — to check for infection, allergy or other conditions
• Allergy skin or blood tests — if asthma or allergies are suspected
• Exercise or walk tests — to see how your breathing copes with activity

What to expect at your appointment

You may be asked not to smoke, drink caffeine, or use your inhalers for a few hours before the test, depending on what your clinic advises — always follow their instructions. Wear loose, comfortable clothing. The test is not painful, but blowing out hard can make you cough or feel a little light-headed for a moment; this passes quickly. You will be coached to do your best, and the person running the test will tell you if you need to try again. Results are usually available the same day, but the meaning behind them should be explained to you by your doctor, who will link the numbers to your symptoms and history.

Treatment

There is no treatment for an FEV number itself. The number is a guide. What matters is finding out why it is higher or lower than expected, and then treating that underlying cause. For some people, treatment means getting asthma well controlled. For others, it means stopping smoking, treating an infection, managing a long-term lung condition, or simply learning better breathing techniques. Your doctor will build a plan around your symptoms, your goals and how your lungs behave over time.

Self-care at home

• If you smoke, stopping is the single most powerful thing you can do for your lungs — ask your doctor or pharmacist for support
• Take any inhalers exactly as prescribed, and ask your pharmacist to check your inhaler technique
• Keep physically active — walking, swimming and gentle exercise all help your lungs and heart work better
• Avoid smoke, dust, strong fumes and other things that trigger your symptoms
• Keep a symptom diary or peak flow record if your doctor asks you to
• Stay well hydrated and use breathing exercises if mucus is a problem
• Keep your home well ventilated and avoid damp and mould
• Attend your reviews so changes can be picked up early

Medical treatments

Treatment depends entirely on what is causing your breathing problem. Options may include inhaled medicines that open up the airways, inhaled medicines that calm inflammation, tablets to treat infection or reduce inflammation, and, for some people, extra oxygen at home. Pulmonary rehabilitation — a supervised programme of exercise and education — helps many people with long-term lung conditions breathe more easily and feel stronger. Physiotherapy can help clear mucus and teach breathing techniques. Your medical team will tailor any treatment to you and will explain the risks and benefits before you start. Never start, stop or change any medicine without speaking to your doctor or pharmacist.

When is surgery considered?

Surgery is rarely needed for lung problems. In a small number of people with severe, carefully selected lung disease, procedures such as lung volume reduction or, very occasionally, a lung transplant may be considered. These decisions are made by specialist teams after detailed assessment, and your doctor can explain whether a referral is appropriate for you.

Living with this condition

Living with a lung condition — or simply keeping an eye on your lung health — is easier when you understand your own numbers. Ask your doctor for a copy of your spirometry results and what your personal targets are. Many people find it helpful to know their usual FEV1 so they can tell when something has changed. Pace yourself on busy days, plan activities around times when your breathing is best, and keep any rescue plan your doctor has given you somewhere you can find it quickly.

Lifestyle tips

• Stay smoke-free, and avoid smoky places
• Build regular, gentle activity into your week — little and often beats occasional bursts
• Keep your home dry, well aired and free of damp and mould
• Use any protective equipment at work, and follow your employer's safety advice
• Get enough sleep, and rest when you feel breathless
• Keep up with routine appointments and vaccinations
• Learn a few simple breathing techniques, such as breathing out slowly through pursed lips, to use when you feel short of breath

Diet and exercise

A balanced diet and regular activity support your lungs and heart. If you are carrying extra weight, losing a little can make breathing easier and improve your test results. If you are underweight or losing weight without trying, that also needs checking. Aim for activity that raises your heart rate gently and makes you slightly breathless but still able to talk — walking, cycling, swimming or an exercise class designed for people with lung conditions. Warm up, go at your own pace, and stop if you feel chest pain, dizziness or severe breathlessness.

Mental health and emotional wellbeing

Breathing problems and anxiety often feed each other. Feeling short of breath can be frightening, and feeling anxious can make you breathe faster and feel more breathless. This is very common and it is not a sign of weakness. Tell your doctor if worry, low mood or panic is affecting your life — talking therapies, breathing retraining and support groups all help. If you are having thoughts of harming yourself, or feel you cannot cope, contact your local emergency number or a crisis support service in your country straight away, and reach out to someone you trust.

Prevention

You cannot 'prevent' an FEV measurement — it is simply a test. But many of the lung problems that lower your FEV can be prevented or slowed. Not smoking, or stopping if you do, is by far the most important step. Avoiding second-hand smoke, protecting yourself from dust and fumes at work, keeping your home free of damp, and staying active all help keep your lungs healthy. If you already have a lung condition, good treatment and regular reviews reduce flare-ups and help keep your lung function as stable as possible.

Vaccines

Vaccination helps prevent the chest infections that can damage lungs and cause flare-ups. Ask your doctor or pharmacist which vaccinations are recommended for you — commonly this includes flu each year, COVID-19 boosters where advised, and pneumonia vaccination for people at higher risk. Recommendations vary by country and by personal health history, so check with your local health service.

Screening programmes

There is no general population screening programme for FEV. Spirometry is offered when you have symptoms, a relevant job exposure, a strong family history, or a known lung condition that needs monitoring. If you have smoked for many years or worked with dust or fumes, ask your doctor whether a breathing test would be sensible for you.

Complications

If left untreated

• Breathlessness gradually getting worse and limiting everyday life
• More frequent flare-ups and chest infections
• Lower oxygen levels in the blood, which can affect energy and thinking
• Extra strain on the heart in some long-term lung conditions
• Loss of fitness and muscle strength from becoming less active
• Sleep problems and tiredness during the day
• Anxiety and low mood related to breathlessness
• Difficulty keeping up with work, family life or hobbies

Long-term outlook

An FEV result is information, not a verdict. Many lung conditions can be well controlled, and many people live full, active lives with them. Catching problems early, getting the right treatment, stopping smoking and staying active all make a real difference. Your numbers can also change over time — sometimes improving with treatment. Work with your doctor to understand your own results and what you can do next; there is usually something that helps.

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