Liver Function Test Normal Range: Understanding ALT AST GGT and Bilirubin

Health · 9 July 2026 · By AROGYOS Team

Introduction to Liver Function Tests

Liver function tests are a group of tests used to assess liver damage or liver disease. These tests measure the levels of certain enzymes and proteins in the blood that are associated with liver function. The most common liver function tests include ALT (Alanine Aminotransferase), AST (Aspartate Aminotransferase), GGT (Gamma-Glutamyl Transferase), and bilirubin. Understanding the normal range for these tests is crucial for identifying potential liver problems.

Understanding ALT and AST Normal Range

ALT and AST are two enzymes that are found primarily in the liver. They are released into the bloodstream when the liver is damaged, making them useful indicators of liver health. The normal range for ALT is typically between 0-55 U/L, while the normal range for AST is between 0-40 U/L. Elevated levels of ALT and AST can indicate liver inflammation or liver damage. It's essential to track these biomarkers regularly to monitor liver health. You can Track your biomarkers free on AROGYOS to stay on top of your liver health.

GGT and Bilirubin Test Meaning

GGT is another enzyme that is found in the liver, and it is often used in conjunction with ALT and AST to assess liver health. The normal range for GGT is typically between 0-60 U/L. Elevated levels of GGT can indicate liver disease or bile duct disease. Bilirubin, on the other hand, is a yellow pigment that is produced during the breakdown of red blood cells. The normal range for bilirubin is typically between 0.1-1.2 mg/dL. Elevated levels of bilirubin can indicate liver disease or hemolytic anemia.

Liver Health Biomarkers and Biological Age

Liver health is closely linked to biological age, which is a measure of the body's functional age. Poor liver health can accelerate biological aging, making it essential to monitor liver health biomarkers regularly. You can learn more about biological age and how to calculate it by reading our blog posts on What is Biological Age and How to Calculate Biological Age. Additionally, you can Analyse your lab report instantly to get a better understanding of your liver health and biological age.

Maintaining Liver Health for Longevity

Maintaining liver health is crucial for overall health and longevity. A healthy liver is essential for detoxification, metabolism, and energy production. To maintain liver health, it's essential to eat a balanced diet, stay hydrated, and avoid toxins. You can also read our blog posts on Anti-Aging Foods India and Longevity Diet India to learn more about how to maintain liver health through diet. Additionally, you can read our blog post on Preventive Health Checkup India to learn more about how to stay on top of your health.

Frequently Asked Questions

Q: What is the normal range for liver function tests? A: The normal range for liver function tests varies depending on the test, but typical ranges are: ALT (0-55 U/L), AST (0-40 U/L), GGT (0-60 U/L), and bilirubin (0.1-1.2 mg/dL). Q: What do elevated liver enzymes indicate? A: Elevated liver enzymes can indicate liver inflammation, liver damage, or liver disease. Q: How can I maintain liver health for longevity? A: Maintaining liver health requires a balanced diet, staying hydrated, avoiding toxins, and regular health check-ups. You can also track your biomarkers and analyze your lab reports to stay on top of your liver health.