Liver Function Tests (LFT)

* Provided by Healthians

Liver Function tests are group of tests ordered to understand how well the Liver is performing


Lab Test

Liver Function Tests (LFT)

* Provided by Healthians

Liver Function tests are group of tests ordered to understand how well the Liver is performing

You can now book lab tests online and have samples collected from your home. Home collection for this test is available in multiple cities.

The liver is the organ that removes all toxic substances from your blood. When you take medicines, it is the liver that helps you detoxify the substances. The liver is unique because it can regenerate itself. Even when a part of liver is damaged, it can regenerate itself from healthy cells. Alcohol and abuse of drugs puts a strain on the liver cells and can cause irreversible damage. Hepatitis primarily affects the liver cells. The liver also produces proteins, enzymes, store vitamins, produces blood clotting factors and helps maintain hormones. The liver also produces bile which helps in digesting fats. Liver function tests are used to understand the health of the liver and its optimal functioning.

Reference Values
Normal levels of AST and ALT may slightly vary depending on the individual laboratory's reference values. Typically, the range for normal AST is reported between 10 to 40 units per litre and ALT between 7 to 56 units per litre. Mild elevations are generally considered to be 2-3 times higher than the normal range.

There may be damage to the liver when the values of AST and ALT are higher. It is observed that in hepatitis, ALT results are higher than AST. Your doctor may also order a Creatinine Kinase or a CK test or a troponin test. A creatine kinase test confirms damage to the muscles and elevated troponin levels means that there is damage to the heart.

Gamma-glutamyl transferase or the GGT test is more sensitive in detecting liver damage from drugs and alcohol. The GGT test is also used for detecting early rejection after liver transplantation.

Gall stones or problem with the gallbladder is usually signalled by elevated bilirubin levels. In newborn babies, raised bilirubin levels could means that there is a problem with the liver.

Liver Function Test (LFT) : Overview, Procedure and Price

What is Liver Function Test (LFT)?

Liver Function Test (LFT) is a medical examination that measures various enzymes, proteins, and substances in the blood to evaluate the liver's health and functionality. This test provides valuable insights into the liver's performance and aids in the diagnosis of liver diseases and conditions.

Why is Liver Function Test (LFT) important?

LFT plays a crucial role in assessing the overall liver function. It helps identify liver damage, monitor the progression of liver diseases, and evaluate the effectiveness of treatments. By analysing the levels of specific markers in the blood, healthcare professionals can detect abnormalities and make informed decisions about the patient's liver health.

Common markers measured in Liver Function Test (LFT)

1. Alanine Transaminase (ALT)

ALT is an enzyme primarily found in the liver. Increased ALT levels in the blood may indicate liver damage or injury, such as hepatitis or cirrhosis. Monitoring ALT levels through LFT helps detect liver diseases in their early stages and guide appropriate treatment plans.

2. Aspartate Transaminase (AST)

AST is another enzyme found in the liver, as well as other organs like the heart, muscles, and kidneys. Elevated AST levels can be a sign of liver damage, but they may also indicate problems in other organs. Liver Function Test helps differentiate between liver-related issues and conditions affecting other organs.

3. Alkaline Phosphatase (ALP)

ALP is an enzyme present in various tissues, including the liver, bones, and intestines. Elevated ALP levels in the blood can indicate liver diseases, gallstones, or bone disorders. Liver Function Test helps identify the source of increased ALP levels and assists in diagnosing specific liver conditions.

How to prepare for Liver Function Test (LFT)?

Before undergoing an LFT, it is essential to follow the healthcare provider's instructions. No fasting is required.

Understanding the results of Liver Function Test (LFT)

After conducting an LFT, the results are analyzed by healthcare professionals. The interpretation of these results depends on various factors, including the patient's medical history, symptoms, and other diagnostic tests. Abnormalities in the liver function markers may indicate specific liver conditions that require further investigation or treatment.


Liver Function Test (LFT) is a vital diagnostic tool for assessing liver health and identifying liver diseases. By measuring enzymes and substances in the blood, LFT helps healthcare professionals evaluate the liver's functionality and detect abnormalities at an early stage. Proper preparation and understanding of the test results are crucial for accurate diagnosis and effective treatment of liver conditions.

Frequently Asked Questions about Liver Function Test (LFT)

The primary purpose of a Liver Function Test (LFT) is to assess the health and functionality of the liver. It helps in diagnosing liver diseases, monitoring the progress of liver conditions, evaluating the effectiveness of treatments, and detecting any abnormalities or damage to the liver.

A Liver Function Test (LFT) typically involves a simple blood test. A healthcare professional will draw a small sample of blood from a vein, usually from your arm. The blood sample is then sent to a laboratory, where it is analyzed to measure various liver function markers, including enzymes, proteins, and other substances.

Fasting is not required before a LFT

Liver Function Test (LFT) is a safe and minimally invasive procedure. The risks and complications are rare but may include bruising or bleeding at the site where blood is drawn, dizziness, or infection. It's important to follow proper guidelines and inform your healthcare provider of any existing medical conditions or medications you are taking.

Abnormal Liver Function Test (LFT) results may suggest various liver conditions or diseases, such as hepatitis, fatty liver disease, cirrhosis, or liver damage. However, abnormal results do not necessarily mean you have a liver problem. Its best to consult a physician - GP/Internal Medicine or Hepatologist to review these tests.