In liver failure, ALT (Alanine aminotransferase) levels can vary. In acute liver failure, ALT levels may be significantly elevated, potentially surpassing 1,000 units per liter (U/L). However, it's important to note that the specific ALT level alone does not determine liver failure. Liver failure is a complex condition involving severe dysfunction of the liver and multiple clinical parameters, such as prothrombin time, bilirubin levels, and mental status. Diagnosis and assessment of liver failure require comprehensive evaluation by a healthcare professional, including clinical presentation, laboratory tests, and imaging studies. Immediate medical attention is crucial in suspected cases of liver failure.