Your liver is one of the hardest-working organs in your body, performing over 500 essential functions including filtering blood, producing bile for digestion, and processing medications.
What Liver Function Tests Measure
A liver function test (LFT) measures several enzymes and proteins in your blood:
ALT (Alanine Aminotransferase) - An enzyme found mainly in the liver. Elevated levels may indicate liver damage.
AST (Aspartate Aminotransferase) - Found in the liver and other organs. High levels can suggest liver problems.
ALP (Alkaline Phosphatase) - Elevated levels may indicate bile duct problems or bone disease.
GGT (Gamma-Glutamyl Transferase) - Often elevated with liver disease or bile duct problems.
Bilirubin - A yellow pigment produced when red blood cells break down. High levels can cause jaundice.
Albumin - A protein made by the liver. Low levels may indicate liver disease.
Causes of Abnormal Results
Elevated liver enzymes can be caused by various factors:
Who Should Get Tested?
Liver function tests may be recommended if you:
At Private Blood Tests London, liver function tests are available as a standalone test or as part of our comprehensive health screening packages.
Learn about decoding your liver function tests, liver health and what blood tests reveal, and explore our liver function test services.
Medical Disclaimer
This article is provided for educational and informational purposes only and should not be considered as medical advice, diagnosis, or treatment. The information presented here is not intended to replace professional medical consultation, diagnosis, or treatment.
Individual symptoms, health concerns, or test results should always be evaluated and interpreted by an appropriately qualified healthcare professional who can consider your full medical history and personal circumstances.
Private Blood Tests London is a nurse-led clinic providing testing and reporting services only. We do not offer diagnoses, prescriptions, or treatment. If you have concerns about your health or test results, please consult your GP or seek appropriate medical advice. For urgent or worsening symptoms, contact NHS 111 or seek immediate medical attention.
Last reviewed: 1 December 2024 · Next review due: 1 December 2025