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Medical Tests
5 min readReviewed Sep 2026Liver Enzymes (ALT, AST, ALP), Explained in Plain Language
Quick Answer (TL;DR)
ALT and AST are enzymes released when liver cells are irritated. ALP and bilirubin point more toward the bile ducts.
What It Means
A liver panel usually reports ALT, AST, ALP, GGT, bilirubin and albumin. The pattern across them matters more than any single raised line.
Why It Matters for Your Health
Mildly raised enzymes are common and often reflect fatty liver related to weight, alcohol, medication or a recent viral illness, all of which are worth identifying early because several are reversible.
Recommended Biomarker or Metric to Track
Note recent alcohol, exercise and supplements alongside each liver panel.
Questions to Ask Your Doctor
Targeted questions based on latest clinical consensus statements.
1Which enzymes were raised, and what pattern does that suggest?
2Could alcohol, a supplement or a medication explain it?
3Do I need an ultrasound or hepatitis testing?
4Is my liver function, as opposed to enzymes, normal?
5When should this be rechecked?
NHS - Liver function tests
MedlinePlus - ALT blood test
American Liver Foundation - Liver function tests
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