Liver Function Test (LFT)
Apr 7, 2026
Liver Function Test (LFT)
A liver function test (LFT) measures enzymes (ALT, AST, GGT, ALP) and proteins (albumin, bilirubin) that indicate how well your liver is functioning—detecting problems ranging from fatty liver disease (affecting 1 in 3 UK adults) to hepatitis, cirrhosis, medication effects, and bile duct issues, often before any symptoms appear. Your liver performs over 500 functions including detoxification, protein production, and metabolism—keeping it healthy is essential.
At Blood Test London, liver function testing costs from £245 with results in 2-3 days. A doctor always reviews every result.
What LFTs Measure
Liver Enzymes
Marker | What It Shows | Elevated In |
|---|---|---|
ALT | Liver cell damage | Fatty liver, hepatitis, medications |
AST | Liver/muscle damage | Same + muscle injury, heart |
GGT | Bile duct, alcohol | Alcohol use, bile duct issues, fatty liver |
ALP | Bile duct, bone | Bile duct obstruction, bone disease |
Liver Proteins
Marker | What It Shows | Abnormal In |
|---|---|---|
Albumin | Liver's synthetic function | Chronic liver disease, malnutrition |
Bilirubin | Bile processing | Jaundice, liver disease, bile duct obstruction |
Total protein | Overall protein production | Various conditions |
Reference Ranges
Marker | Normal Range |
|---|---|
ALT | 7-56 U/L |
AST | 10-40 U/L |
GGT | 9-48 U/L (men), 9-36 U/L (women) |
ALP | 30-130 U/L |
Bilirubin | 3-17 μmol/L |
Albumin | 35-50 g/L |
Common Causes of Abnormal LFTs
Elevated ALT/AST
Non-alcoholic fatty liver disease (NAFLD)—most common
Alcohol excess
Viral hepatitis (B, C)
Medications (statins, paracetamol, others)
Autoimmune hepatitis
Coeliac disease
Thyroid disease
Elevated GGT
Alcohol (very sensitive marker)
Fatty liver
Bile duct problems
Medications
Elevated ALP
Bile duct obstruction
Bone disease
Pregnancy (normal)
Growing children (normal)
Who Should Test?
Regular alcohol consumption
Overweight or obese
Type 2 diabetes
Taking regular medications
Unexplained fatigue
History of hepatitis exposure
Abnormal previous results
Family history of liver disease
Annual health check
Our Liver Testing Options
Basic LFT Panel - £245
ALT, AST, GGT, ALP
Bilirubin, albumin
Doctor review
Comprehensive Liver Panel - £295
Full LFT
Hepatitis B & C screening
Full interpretation
Liver + Metabolic Health - £395
Full LFT
Fasting glucose, HbA1c
Lipid profile
Full health interpretation
Book Your Test
Price: From £245
Results: 2-3 days
Doctor review: A doctor always reviews every result
Fasting: Not required (but may help for comprehensive assessment)
Book via WhatsApp | Phone: 020 3951 3429
Blood Test London by The Wellness. Liver function testing from £245. A doctor always reviews every result.