LFT (Liver Function Test)

Liver Function Test (LFT) is a group of blood tests that help evaluate the health and performance of the liver. These tests measure levels of liver enzymes, proteins, and bilirubin in the blood to detect liver inflammation, damage, infections, or underlying diseases. The LFT is essential for diagnosing and monitoring conditions such as hepatitis, fatty liver, liver cirrhosis, and the effects of medications or alcohol.

Types of LFT Parameters Tested

• ALT (Alanine Aminotransferase): Indicates liver cell injury
• AST (Aspartate Aminotransferase): Helps detect liver damage or muscle injury
• ALP (Alkaline Phosphatase): Detects bile duct problems
• GGT (Gamma-Glutamyl Transferase): Identifies bile flow obstructions or alcohol-related liver disease
• Total & Direct Bilirubin: Measures waste from red blood cell breakdown; indicates jaundice or bile blockage
• Albumin: Evaluates liver’s protein-producing ability
• Total Protein: Assesses nutritional and liver health
• Prothrombin Time (optional): Evaluates blood clotting function related to liver health

Uses of LFT Test

• Diagnosing liver diseases such as hepatitis, cirrhosis, and fatty liver
• Monitoring alcohol-induced liver damage
• Assessing the effects of medications or toxic substances on the liver
• Evaluating jaundice or yellowing of the skin and eyes
• Monitoring chronic liver conditions and treatment response
• Part of routine health checkups for high-risk individuals (alcohol use, obesity, diabetes)
• Assessing liver function before surgery or during hospitalization

Preparation

• Fasting: Fasting for 8–10 hours may be recommended for accurate results (check with your doctor)
• Medications: Inform your doctor about any medications or supplements you're taking, as some may affect results
• Hydration: Drink water; avoid alcohol 24 hours before the test
• Avoid Overexertion: Rest before the test as extreme physical activity may affect enzyme levels

Frequently Asked Questions (FAQs)

1. What is an LFT test?
LFT is a group of blood tests used to assess how well your liver is functioning and to detect liver damage.

2. Is fasting necessary for LFT?
Fasting is sometimes recommended, especially if the test is combined with other metabolic panels. Always confirm with your healthcare provider.

3. What can an abnormal LFT indicate?
Elevated enzyme or bilirubin levels may indicate liver inflammation, infections, blockages, or damage due to alcohol or drugs.

4. How is the test performed?
A small blood sample is drawn from a vein in your arm.

5. Is the test painful?
Only a minor prick is felt during the blood draw; it’s generally quick and painless.

6. How long do results take?
LFT results are typically available within 12–24 hours.

7. Can liver damage be detected early with LFT?
Yes, LFTs are effective in detecting early signs of liver stress or dysfunction before symptoms appear.

8. How often should I take an LFT?
If you are at risk (due to alcohol use, medications, hepatitis, obesity), regular monitoring may be advised. Otherwise, it's part of routine annual health checks.