The Liver Function Test (LFT blood test) is a group of blood tests used to assess how well your liver is working. It helps detect liver disease, monitor ongoing conditions, and evaluate overall liver health.
LFTs measure important enzymes, proteins, and substances in the blood that reflect liver function and damage.
This test is widely used for early detection of liver problems and ongoing health monitoring.
What is LFT (Liver Function Test)?
A Liver Function Test, also known as a liver panel, is a blood test that evaluates liver health by measuring key biomarkers in the bloodstream. The liver plays a vital role in:- Detoxifying harmful substances
- Producing essential proteins
- Supporting digestion
- Regulating metabolism
Why take an LFT blood test?
An LFT blood test is used for both diagnosis and prevention. It provides valuable insight into liver health and helps detect issues early.
It is commonly used to:
- Detect liver disease early
- Monitor chronic liver conditions
- Investigate symptoms such as fatigue or jaundice
- Assess liver damage caused by alcohol or medication
- Check overall metabolic health
Early testing allows faster diagnosis and more effective treatment planning.
What does the LFT blood test measure?
An LFT blood test measures several key liver markers:
- ALT (Alanine Aminotransferase) – ALT is an enzyme mainly found in liver cells. High levels may indicate liver inflammation or cell damage.
- AST (Aspartate Aminotransferase) – AST is found in the liver, heart, and muscles. Elevated levels may suggest liver damage but are less specific than ALT.
- ALP (Alkaline Phosphatase) – ALP is linked to bile ducts and bones. High levels may indicate bile duct blockage or liver/bone conditions.
- GGT (Gamma-Glutamyl Transferase) – GGT is highly sensitive to alcohol-related liver damage and bile duct issues.
- Bilirubin – Bilirubin is produced when red blood cells break down. High levels may indicate liver dysfunction or jaundice.
- Albumin – Albumin is a protein produced by the liver. Low levels may suggest chronic liver disease or reduced liver function.
- Total Protein – This measures albumin and globulin levels, helping assess liver, kidney, and nutritional health.
- Creatine Kinase (CK) – CK is linked to muscle activity. Abnormal levels may sometimes reflect liver or muscle damage.
Common liver conditions detected with LFT tests
LFT blood tests can help identify or monitor a range of liver conditions, including:
- Cirrhosis – A late-stage liver condition involving scarring of liver tissue, often linked to hepatitis or long-term alcohol use.
- Non-Alcoholic Fatty Liver Disease (NAFLD) – A condition where fat builds up in the liver, commonly associated with obesity and metabolic syndrome.
- Hepatitis – Inflammation of the liver, often caused by viral infection or autoimmune conditions.
- Alcohol-related liver disease – Caused by long-term alcohol consumption, leading to inflammation and potential liver damage.
Symptoms of liver problems
If the liver is not functioning properly, you may experience:
- Fatigue
- Loss of appetite
- Nausea or vomiting
- Abdominal discomfort
- Itchy skin
- Dark urine
- Jaundice (yellowing of skin or eyes)
- Unexplained weight loss
If symptoms persist, a liver function blood test can help identify the cause.
How to prepare for an LFT blood test
In most cases, no special preparation is required, but some guidelines may help ensure accurate results:
- Avoid alcohol for at least 24 hours before testing
- Follow fasting instructions if advised (8–12 hours)
- Inform your clinician about any medication or supplements
- Stay hydrated unless instructed otherwise
Why liver health matters
The liver plays a key role in detoxification, digestion, and metabolism. Poor liver function can affect many systems in the body.
Regular LFT testing helps:
- Detect problems early
- Monitor existing conditions
- Support long-term health management
- Track the impact of medication or lifestyle changes
We offer a comprehensive Liver Function Test (LFT blood test) designed to assess key markers of liver health, including enzymes, proteins, and bilirubin levels.
This test is suitable for individuals who want to:
- Check overall liver health
- Investigate symptoms such as fatigue or jaundice
- Monitor existing liver conditions
- Assess the impact of medication or alcohol use
Your sample is processed using high-quality laboratory methods to ensure accurate and reliable results.
Fast turnaround times and confidential results are provided.
Our LFT Blood Test (Liver Function) is available.
Trusted medical information and further reading
The information on this page is based on widely recognised clinical guidance used within UK healthcare systems.
Liver Function Tests (LFTs) are routinely used across the NHS to assess liver health, diagnose liver disease, and monitor ongoing medical conditions.
For more detailed and trusted medical guidance, you can refer to the following reputable organisations:
- NHS – Liver disease overview
Learn how liver blood tests are used to assess liver health, detect disease, and monitor treatment. Visit NHS liver disease information
- NHS – Blood tests (general guidance)
Official NHS information on why blood tests are performed and what results may indicate. Visit NHS blood tests information
- NHS – Alcohol-related liver disease
Information on how alcohol can affect liver function and long-term liver health. Visit NHS liver disease guidance
- NICE (National Institute for Health and Care Excellence)
Evidence-based clinical guidelines used across the UK for diagnosing and managing liver conditions. Visit NICE guidelines
- Mayo Clinic – Liver function tests (international reference)
Provides detailed clinical explanations of liver enzymes and what abnormal results may mean. Visit Mayo Clinic information
- Cleveland Clinic – Liver function tests explained
Clear breakdown of ALT, AST, ALP, bilirubin and protein markers. Visit Cleveland Clinic information
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