LFT (Liver Function Tests)
Also known as: Liver test, Liver profile, jigar ka test, yarqan ka test
A group of tests — ALT, AST, ALP, bilirubin and albumin — that show liver inflammation, bile flow and how well the liver makes proteins.
Why it's ordered
Investigating jaundice, hepatitis, fatty liver, alcohol effects, and monitoring medicines that can affect the liver.
Preparation
Usually no fasting needed. Tell the lab about medicines and supplements you take.
Typical adult values
| ALT / AST | upper limit usually 35–55 U/L, depending on the lab |
|---|---|
| Total bilirubin | about 0.3–1.2 mg/dL |
| Albumin | about 3.5–5.0 g/dL |
| ALP | lab-specific; higher in teenagers and pregnancy |
Ranges vary between labs and methods. Always use the range printed on your report.
If it's high
High ALT/AST suggest liver cell injury (e.g. viral hepatitis, fatty liver, medicines). High bilirubin can cause jaundice. High ALP can point to bile-duct or bone conditions.
If it's low
Low albumin can reflect long-term liver disease, kidney protein loss or poor nutrition.
Good to know
Mildly raised ALT is very common with fatty liver. With diabetes, the FIB-4 score (using ALT, AST, platelets and age) helps estimate liver scarring.
Common questions
Do I need to fast for an LFT?
Usually no fasting needed. Tell the lab about medicines and supplements you take.
What does a high ALT mean?
High ALT suggests liver cell injury, for example from viral hepatitis, fatty liver or medicines. Mildly raised ALT is very common with fatty liver.
What does high bilirubin mean?
High bilirubin can cause jaundice. Total bilirubin is typically about 0.3–1.2 mg/dL. Always use the range printed on your report.
What does low albumin mean?
Low albumin can reflect long-term liver disease, kidney protein loss or poor nutrition.