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HomeTests ExplainedLiver Function Test

BLOOD TEST · SMART CARE POLYCLINIC, DEIRA

Liver Function Test explained

A group of measurements showing whether the liver is inflamed, obstructed, or working normally.

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SAMPLE
Blood
FASTING
Not needed for the liver tests, but usually taken with a fasting lipid profile
INCLUDED IN
4 packages
WHERE
29 Doha Centre, Al Maktoum Rd, Deira

What the Liver Function Test measures

Not one measurement but several. Some are enzymes that leak from liver cells when those cells are irritated; others are substances the liver makes or clears, which move when it is not keeping up. How an abnormal result should be interpreted and worked up follows the American College of Gastroenterology guideline — a mildly raised enzyme is common and often not liver disease at all.1

What the result tells you

Raised enzymes mean irritation, not failure

Whether the liver is still doing its job is answered by albumin and bilirubin, not by ALT and AST. Those are separate questions.

In this region, fatty liver first

A mild rise alongside weight, blood sugar or cholesterol is most often fatty liver — which is why the panel is read next to the lipid profile and HbA1c.

The pattern beats any single number

Enzymes up with bilirubin points somewhere different from enzymes up alone. A doctor reads which measurements moved, and by how much.

Mild rises are often reversible

Usually repeated after a period of change — weight, alcohol, a medicine reviewed — before anything further is arranged.

What is measured

ALT (SGPT)

Sits mainly in liver cells, so it is the most liver-specific of the group.

AST (SGOT)

Found in the liver but also in muscle, so hard exercise can raise it with no liver problem.

Alkaline Phosphatase (ALP)

Rises when bile flow is obstructed, and also comes from bone.

Bilirubin

The pigment the liver clears. A rise is what makes eyes and skin look yellow.

Albumin

The main protein the liver makes. Falls when the liver has been under strain for a long time.

Total Protein

Albumin plus the antibody proteins, read together with it.

How to prepare

Fasting
Not needed for the liver tests, but usually taken with a fasting lipid profile
Best time
Morning, with the rest of the panel
Avoid before
  • Alcohol for 2–3 days
  • Heavy exercise for 2–3 days

What can move the result

A result outside the usual range does not on its own mean something is wrong. These are the everyday explanations a doctor considers first.

Fatty liver, strongly linked to weight and blood sugar
Alcohol, including one heavy episode days before
Paracetamol, some cholesterol tablets and some antibiotics
Viral hepatitis
Intense exercise, which raises AST from muscle

Frequently asked questions

Not one measurement but several. Some are enzymes that leak from liver cells when those cells are irritated; others are substances the liver makes or clears, which move when it is not keeping up. How an abnormal result should be interpreted and worked up follows the American College of Gastroenterology guideline — a mildly raised enzyme is common and often not liver disease at all. Raised enzymes mean irritation, not failure: Whether the liver is still doing its job is answered by albumin and bilirubin, not by ALT and AST. Those are separate questions.

Sources

Written from current guidance and reviewed 31 August 2026.

Sources cited above

  1. Kwo PY, Cohen SM, Lim JK. ACG Clinical Guideline: Evaluation of Abnormal Liver Chemistries. The American Journal of Gastroenterology. 2017;112(1):18-35. PMID 27995906. doi:10.1038/ajg.2016.517The American College of Gastroenterology guideline on what a raised liver enzyme actually means and how an abnormal result should be worked up.

Sources are listed for the specific statements they support. They are published research and guidance, not a substitute for a consultation — what applies to you is decided by a doctor who has assessed you.