Diagnostics·Diagnostics
Liver function tests
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Liver function tests (LFTs) are a group of blood tests that help check how well your liver is working. They measure levels of certain proteins, enzymes, and waste products that the liver makes or processes. Abnormal results can point to liver injury or disease, but they are not a diagnosis on their own.
Key facts
Yes, liver function tests are very common. Many people have them done during routine health checks or when they have symptoms like fatigue, jaundice, or abdominal pain.
Anyone can have liver function tests. They are often done for people with risk factors for liver disease, such as heavy alcohol use, obesity, diabetes, or a family history of liver problems, as well as for those taking certain medications.
Liver function tests are diagnosed through a simple blood sample taken from a vein in your arm. The lab measures several markers; if results are abnormal, your doctor may order further tests to find the cause.
The blood test itself takes only a few minutes. You may be asked to avoid food or drink for 8–12 hours beforehand because certain results (like fasting sugar or some enzymes) can be affected. After the test, you can go back to normal activities. Your doctor will discuss the results with you, usually within a few days.
Treatment depends entirely on what is causing the abnormal liver function. The goal is to address the underlying problem, not to 'fix' the LFT numbers directly. Your doctor will explain the most appropriate options based on your results and overall health.
Depending on the cause, treatment may include medications to manage hepatitis (antiviral drugs), medicines to reduce inflammation, or treatments to help remove excess iron or copper. In cases of fatty liver disease, lifestyle changes are often the main treatment. Never stop or change any prescribed medications without talking to your doctor.
Living with abnormal liver function often means making long-term healthy choices. You will need regular check-ups and blood tests to monitor your liver. It's important to follow your doctor's advice and avoid things that can harm the liver, like excessive alcohol and certain medications.
A liver-friendly diet includes plenty of vegetables, fruits, whole grains, and lean protein (like fish, chicken, or beans). Limit salt, sugar, and saturated fats. Regular moderate exercise, such as walking or cycling for 30 minutes most days, can help reduce liver fat and improve overall health.
You can reduce your risk of liver problems by avoiding excessive alcohol, getting vaccinated for hepatitis A and B, maintaining a healthy weight, and not taking unnecessary medications or risky supplements. However, some liver conditions are not fully preventable, such as autoimmune liver disease.
Hepatitis A and hepatitis B vaccines are available and recommended for people at higher risk, such as those with chronic liver disease, people who travel to areas with high hepatitis rates, and people with certain jobs.
Routine screening for hepatitis B and C is not done for everyone, but it may be recommended if you have risk factors. Your doctor can advise if screening is right for you.
For many people, abnormal liver function tests improve once the underlying cause is addressed, especially if caught early. With lifestyle changes and proper medical care, even some advanced liver conditions can be managed well. Regular monitoring gives you the best chance of staying healthy.
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 may be needed if there is a blockage in the bile ducts, a liver abscess, or a tumour. Liver transplantation is considered only for severe, irreversible liver failure.
Having concerns about your liver can cause anxiety or stress. It's normal to feel worried, especially if you need more tests. Talk to your doctor about your feelings, and consider speaking with a counsellor or support group. Taking care of your mental health is part of taking care of your liver.
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