---
title: "Alanine Aminotransferase (ALT) Test: What It Measures"
description: "ALT measures a liver enzyme that rises with liver-cell irritation or injury; order and track it through Vitals Vault with Quest lab access and PocketMD."
canonical: "https://www.vitalsvault.com/biomarkers/alanine-aminotransferase-alt"
last-updated: 2026-08-22
---

# Alanine Aminotransferase (ALT) Test: What It Measures

> ALT measures a liver enzyme that rises with liver-cell irritation or injury; order and track it through Vitals Vault with Quest lab access and PocketMD.

---

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