Cytolysis (the cytolysis syndrome)

the destruction of liver cells with release of enzymes into the blood

Cytolysis — enzymes leaking out of damaged liver cells

Cytolysis (the cytolysis syndrome) is damage to and death of liver cells, in which their internal enzymes — ALT and AST — leak into the blood. That is why a rise in transaminases on a test is the laboratory marker of cytolysis.

This is not a diagnosis but a syndrome: it only says that hepatocytes are being damaged. The cause — a virus, alcohol, NASH, medications — is sought separately.

What ALT and AST show

ALT is more specific to the liver, whereas AST is also found in muscle and the heart. The height of the rise itself hints at the cause: a mild rise (up to 3-fold) occurs with fatty liver disease, while a very high one (more than 10–15-fold) occurs with acute hepatitis, poisoning or liver ischemia.

The AST/ALT ratio (the De Ritis coefficient)

The ratio of the enzymes also helps. With viral and fatty damage, ALT is usually higher than AST (ratio < 1). An AST/ALT ratio above 2 is characteristic of alcoholic damage, and a rise above 1 often accompanies the transition to cirrhosis.

What to do about a rise

An isolated rise is rechecked, the history is clarified (alcohol, medications, supplements, weight), the person is tested for viral hepatitis and metabolic causes, and an ultrasound is done. It is useful to assess whether there is cholestasis at the same time — the R-factor is calculated for this.

Reference ranges

How the degree of cytolysis is roughly graded by transaminases (in multiples of the upper limit of normal, ULN).

Minimal	up to 3× ULN
Moderate	3–10× ULN
Marked	> 10× ULN (acute hepatitis, toxins, ischemia)
AST/ALT (the De Ritis coefficient)	> 2 — argues for alcoholic damage

Important: Normal ALT and AST do not rule out liver disease; the values are interpreted in the context of the whole picture.

Calculate using this marker

Calculators where Cytolysis (hepatocellular injury) is used directly:

R-Factor Shows what's driving the injury — cholestasis or liver-cell death Open

Frequently asked questions

Is the cytolysis syndrome dangerous?

The danger depends on the cause and the degree of the enzyme rise. Cytolysis itself is a signal that liver cells are being damaged, and a reason to find and remove the cause.

ALT higher than AST — what does that mean?

It more often points to non-alcoholic or viral damage. The opposite picture, when AST is more than twice ALT, is characteristic of alcohol and of late stages of fibrosis.

Sources

info

This content is educational and does not replace consultation with a physician. Reference ranges may vary depending on the laboratory and method — rely on the ranges stated on your own test report.

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