The ALT/AST Ratio Calculator divides your ALT (alanine aminotransferase) by your AST (aspartate aminotransferase) liver enzyme levels. This ratio helps clinicians differentiate between types of liver disease.
An AST/ALT ratio < 1 suggests non-alcoholic fatty liver disease or viral hepatitis. A ratio > 2 strongly suggests alcoholic liver disease. A ratio > 1 with elevated enzymes may indicate cirrhosis.
Normal ALT: 7–56 U/L. Normal AST: 10–40 U/L. De Ritis ratio: healthy liver ~0.8, NAFLD < 1, alcoholic hepatitis > 2.
| AST/ALT Ratio | Likely Condition | Severity Indicator |
|---|---|---|
| NAFLD or viral hepatitis | Usually mild–moderate | |
| 1.0 – 1.5 | May indicate fibrosis progression | Moderate |
| 1.5 – 2.0 | Possible cirrhosis | Moderate–severe |
| > 2.0 | Alcoholic liver disease | Severe |
The ALT AST Ratio Calculator helps estimate the ratio between two important liver enzymes: alanine aminotransferase (ALT) and aspartate aminotransferase (AST). These enzymes are commonly measured in blood tests to assess liver function and detect possible liver injury.
Interpreting the relationship between AST and ALT can provide additional clinical insight beyond individual enzyme values. The AST to ALT ratio is often used in medical practice to help identify patterns associated with different types of liver conditions.
ALT and AST are enzymes found primarily in liver cells, although AST is also present in other tissues such as the heart and muscles. When liver cells are damaged or inflamed, these enzymes may leak into the bloodstream, resulting in elevated levels detectable through laboratory tests.
The AST to ALT ratio is calculated by dividing the AST value by the ALT value. This ratio can sometimes help clinicians distinguish between different causes of liver enzyme elevation. For example, certain patterns may appear in alcohol-related liver disease, non-alcoholic fatty liver disease, or viral hepatitis.
However, the AST to ALT ratio is only one part of liver health evaluation. Medical professionals typically interpret this value alongside other laboratory markers, imaging studies, patient history, and clinical symptoms. As a result, the calculator provides an estimate that should be interpreted within a broader clinical context.
Understanding this calculator can raise questions. Here you’ll find clear, evidence-based answers to help you interpret your results and understand the science behind it.
The AST to ALT ratio is calculated by dividing the AST blood level by the ALT blood level. This ratio can help clinicians evaluate patterns of liver enzyme elevation and may offer clues about underlying liver conditions.
In many healthy individuals, the AST to ALT ratio is typically below 1. However, values can vary depending on individual health, laboratory standards, and underlying medical conditions.
An AST to ALT ratio greater than 2 is sometimes associated with alcohol-related liver disease. However, other factors may influence the ratio, and interpretation should always be performed by a healthcare professional.
No. The ratio alone cannot diagnose liver disease. It is only one component of liver function evaluation and must be interpreted together with other blood tests, medical history, imaging, and clinical examination.
The ALT AST Ratio Calculator provides a simple way to estimate the relationship between two key liver enzymes. By calculating the AST to ALT ratio, the tool helps users better understand how laboratory values may relate to liver health assessment.
While the ratio can offer useful insights, it should not replace professional medical evaluation. The ALT AST Ratio Calculator is best used as an educational tool to help interpret laboratory results and encourage informed discussions with healthcare professionals.
