The ALT (Alanine Aminotransferase) Blood Test measures the level of ALT enzyme in your blood. ALT is found mainly in the liver. When liver cells are damaged or inflamed, ALT can leak into the bloodstream, causing the level to rise.

ALT is one of the most commonly ordered liver tests and is often included in Liver Function Tests (LFT) and the Comprehensive Metabolic Panel (CMP). It helps doctors evaluate liver health, especially when symptoms or risk factors suggest liver stress or disease.

At MCV Blood test (Houston, TX), we provide accurate ALT testing with fast turnaround and secure reporting for physician evaluation.

ALT is a sensitive marker of liver cell injury. Elevated ALT may be seen in fatty liver disease, viral hepatitis (A, B, C), alcohol-related liver injury, medication side effects, toxin exposure, and bile duct problems.

Doctors interpret ALT together with other tests like AST, ALP, bilirubin, GGT, and imaging, because ALT alone cannot identify the exact cause. The pattern and level of elevation often guide next steps such as repeat testing, hepatitis screening, ultrasound, or medication review.

ALT is also used to monitor chronic conditions and medications that affect the liver (for example, statins, certain antibiotics, antifungals, and other long-term therapies).