Biomarker education

ALT: What It Measures & Why People Track It

Also called: Alanine aminotransferase, SGPT

ALT is an enzyme often included in liver-related blood panels.

General biomarker education — not personalized medical advice. Learn more

Result on your report

Illustrative

ALT

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Range: Low – High

LowReference intervalHigh

What it generally measures

ALT is found in liver cells and elsewhere. Blood levels can change for many reasons; labs report activity or concentration according to their method.

Common units on reports: U/L

ALT is commonly compared across panels with AST and other markers. Trends are context for a clinical conversation, not a diagnosis.

Changes over time do not by themselves establish a diagnosis. Learn more

Questions to bring

Illustrative

Ask how ALT compares with AST and prior results.

Share medication, supplement, or illness context your clinician has asked about before.

Confirm the reference range printed on your source report.

Organize your own lab history

Part of Kind Panel education · Lab results guide

Reference range

ALT reference range

What the range on your report means for this marker.

Panel guide

Related panel guide

Understand the broader panel this marker appears on.

Related biomarker

AST

AST is an enzyme measured on many metabolic or liver panels and reviewed alongside ALT.