Liver Function Test (LFT)
What Is This Test?
The Liver Function Test (LFT) is a group of blood tests that evaluates the health and functioning of the liver. It measures liver enzymes, proteins, and bilirubin levels to assess how well the liver is working and to detect liver damage or disease.
LFT is commonly used to diagnose liver disorders, monitor ongoing liver diseases, assess the effects of medications, and evaluate liver function before surgery or during routine health check-ups.
Why this test is performed?
Doctors may recommend the Liver Function Test (LFT) to:
- Evaluate liver health
- Diagnose liver diseases such as hepatitis or fatty liver
- Monitor chronic liver diseases
- Assess abnormal liver enzyme levels
- Investigate jaundice
- Monitor the effects of medications that may affect the liver
- Evaluate alcohol-related liver disease
- Assess liver function before surgery
- Monitor recovery after liver treatment
- Screen individuals at risk of liver disease
Test Preparation
Fasting is usually not required, but some laboratories may recommend 8–12 hours of fasting if additional tests (such as lipid profile) are ordered.
Drink water normally unless instructed otherwise.
Avoid alcohol for at least 24–48 hours before the test if possible.
Inform your doctor about all medications and supplements, including herbal products, as some can affect liver function test results.
Medical disclaimer
This article is for general information and education only. It is not medical advice, does not create a doctor–patient relationship, and is not a substitute for consultation with a qualified doctor who has assessed your individual situation. Never delay seeking medical advice because of something you have read here.
In a medical emergency, call 112, or 108 for an ambulance where that service operates, or go to your nearest emergency department. If you are in mental health distress, Tele-MANAS is free and available 24×7 on 14416.
Read our Editorial Policy and Medical Review Process.
