Liver Function Test Reference Guide
A liver function test (LFT) checks enzymes, proteins and bilirubin made or processed by your liver. This guide explains each one.
The Liver Function Test Reference Guide is being built
This free reference guide will appear here shortly. Meanwhile, the formula and ranges below show exactly how it works.
- LFT parameter or report values
- Meaning of each value
- Low / normal / high
About the Liver Function Test Reference Guide
LFTs help detect fatty liver, hepatitis, alcohol-related damage and bile duct problems — often before symptoms appear.
Reference ranges & how it works
Typical adult ranges (lab-dependent):
ALT (SGPT): about 7–56 U/L · AST (SGOT): about 10–40 U/L
ALP: about 44–147 U/L · GGT: about 9–48 U/L
Total bilirubin: 0.1–1.2 mg/dL · Direct bilirubin: 0–0.3 mg/dL
Total protein: 6.0–8.3 g/dL · Albumin: 3.5–5.0 g/dL
The AST/ALT ratio helps doctors judge the likely cause of liver damage.
Frequently asked questions
Do I need to fast for an LFT?
Many labs recommend 8–12 hours of fasting for LFT. Check with your lab when booking.
What does high SGPT (ALT) mean?
Mildly high ALT is often due to fatty liver, alcohol or some medicines. Very high levels can mean hepatitis. Your doctor will interpret it with the other results.
Medical disclaimer: These tools give general information and estimates only. They are not a diagnosis and do not replace advice from a qualified doctor. Always talk to your doctor about your results, and seek urgent medical help in an emergency.