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The sweat test is a simple, painless test used to help diagnose cystic fibrosis. Cystic fibrosis is an inherited condition that affects the lungs and digestive system, causing thick, sticky mucus to build up. The sweat test measures the amount of salt (chloride) in a person's sweat. People with cystic fibrosis have higher levels of salt in their sweat.
Key facts
Cystic fibrosis is not common. It affects about 1 in every 2,500 babies born in the UK. The sweat test is a routine test for babies who may have signs of the condition.
The sweat test is used for anyone suspected of having cystic fibrosis. Most often, it is done in newborns as part of a national screening programme, or in children and adults who have symptoms like persistent lung infections or poor growth.
Cystic fibrosis is diagnosed through a combination of newborn screening, the sweat test, and genetic testing. The sweat test is the key diagnostic test.
The sweat test is done in a hospital or clinic. It is painless and takes about an hour. Your skin will be cleaned, and a small device is placed on the arm or leg that produces a mild tingling or warm feeling. Sweat is collected in a small tube and sent to a lab. Results usually come back within a few days. A high chloride level (over 60 mmol/L) suggests cystic fibrosis.
There is no cure for cystic fibrosis, but treatments can help manage symptoms, improve quality of life, and extend life expectancy. Treatment is tailored to each person and often involves a team of specialists.
Medical treatment includes medications to thin mucus (mucolytics), antibiotics to fight lung infections, anti-inflammatory drugs, and enzyme replacement therapy to aid digestion. Newer therapies called CFTR modulators can help correct the faulty protein in some people. Treatment plans are managed by a specialist cystic fibrosis team.
Living with cystic fibrosis requires a daily routine of treatments, including physiotherapy, taking medications, and monitoring symptoms. Many people with CF lead active lives, go to school or work, and have families. With modern treatments, life expectancy has improved significantly.
A dietitian will recommend a diet high in calories, protein, and fat, plus extra salt in hot weather. Pancreatic enzyme supplements help absorb nutrients. Regular exercise, such as swimming or cycling, helps improve lung function and fitness.
Cystic fibrosis cannot be prevented because it is genetic. However, genetic counselling can help families understand the risks and options, such as prenatal testing or preimplantation genetic diagnosis (PGD).
People with cystic fibrosis should have all routine childhood vaccinations, as well as annual flu shots and vaccines for pneumonia and COVID-19. These help prevent infections that could be more severe.
Newborn screening in the UK includes a blood spot test that can detect cystic fibrosis early. Carrier testing is available for adults with a family history or who are planning a pregnancy.
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Always verify with your doctor
Health guidelines vary by country and region. The information in this article is based on international clinical guidelines but may not reflect the specific guidelines, medications, or practices in your country. Always discuss your health concerns with your own doctor or healthcare provider, and refer to your local national health guidelines where available.
Important notice This information is for educational purposes only. It does not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your specific situation. If you are experiencing a medical emergency, call your local emergency services immediately.
This article is educational and is prepared with reference to recognized health information and clinical guidance sources where available. Specific source links may vary by topic.
Last updated: July 8, 2026
Educational note: This information is for education only and is not a diagnosis.
Use it to support, not replace, advice from a licensed clinician.
If symptoms are severe, worsening, or urgent, call your local emergency number or seek emergency care.
Surgery is not common but may be considered for severe cases, such as a lung transplant or surgery to correct a bowel blockage in newborns.
Living with a chronic condition can be emotionally challenging. It is normal to feel anxious, stressed, or sad at times. Many people find it helpful to talk to a counsellor or psychologist, or connect with others who have CF. It's important to look after your mental health as well as your physical health.
With early diagnosis and modern treatments, many people with cystic fibrosis now live into their 40s, 50s, and beyond. Each person's outlook depends on their specific genetic mutation and how well the condition is managed. A positive, proactive approach to treatment can make a big difference.