This ratio helps distinguish between different causes of liver injury. A ratio greater than 2 strongly suggests alcoholic liver disease, while a ratio less than 1 is typical of non-alcoholic fatty liver disease (NAFLD) and viral hepatitis. The ratio increases as liver disease progresses to cirrhosis. It's a valuable tool for narrowing down the cause of elevated liver enzymes.
This ratio helps distinguish between different causes of liver injury. A ratio greater than 2 strongly suggests alcoholic liver disease, while a ratio less than 1 is typical of non-alcoholic fatty liver disease (NAFLD) and viral hepatitis. The ratio increases as liver disease progresses to cirrhosis. It's a valuable tool for narrowing down the cause of elevated liver enzymes.
The AST to ALT ratio (also known as De Ritis ratio) compares two liver enzymes to help differentiate between various types of liver disease and assess liver health.
Reference ranges may vary slightly between laboratories. The values below represent commonly accepted clinical ranges.
Ranges shown are general guidelines. Consult your provider for personalized interpretation.
| Biomarker | Reference range | Interpretation |
|---|---|---|
AST:ALT Ratio (Male — Optimal) | 10–26 U/L | Target range for optimal health |
AST:ALT Ratio (Female — Optimal) | 10–26 U/L | Target range for optimal health |
AST:ALT Ratio (Male — Standard) | 9–46 U/L | Standard lab reference range |
AST:ALT Ratio (Female — Standard) | 9–46 U/L | Standard lab reference range |
High AST:ALT Ratio levels above the standard range may indicate an underlying health condition that warrants further evaluation.
Low AST:ALT Ratio levels below the standard range may indicate an underlying health condition that warrants further evaluation.
The AST to ALT ratio (also known as De Ritis ratio) compares two liver enzymes to help differentiate between various types of liver disease and assess liver health.
Optimal range men: 10–26 U/L; women: 10–26 U/L. Standard range men: 9–46 U/L; women: 9–46 U/L. Always interpret ranges in clinical context, not as a stand-alone diagnosis.
This ratio helps distinguish between different causes of liver injury. A ratio greater than 2 strongly suggests alcoholic liver disease, while a ratio less than 1 is typical of non-alcoholic fatty liver disease (NAFLD) and viral hepatitis. The ratio increases as liver disease progresses to cirrhosis. It's a valuable tool for narrowing down the cause of elevated liver enzymes.
Abnormal ratios themselves don't cause symptoms, but underlying liver conditions may cause: fatigue, abdominal pain (especially upper right), nausea, jaundice (yellowing of skin/eyes), dark urine, and unexplained weight loss.
High ratio (>2): Alcoholic liver disease, cirrhosis, muscle damage, heart attack. Ratio 1-2: Mixed or advanced liver disease. Low ratio (<1): Non-alcoholic fatty liver disease (NAFLD), viral hepatitis, drug-induced liver injury.
AST:ALT Ratio can be ordered through Vitals Vault without a doctor referral, then completed at CLIA-certified Quest Diagnostics locations nationwide. After checkout, you receive clear draw instructions, digital requisition details, and a structured report that explains whether your result is in standard range, optimal range, or needs follow-up review.
Start by identifying the root cause, then use targeted nutrition, training, sleep, stress, and follow-up retesting to verify improvement. AST:ALT Ratio should be optimized with a personalized plan, not guesswork.
You should speak with a clinician if AST:ALT Ratio is significantly outside the reference range, trending in the wrong direction across repeat tests, or accompanied by symptoms like fatigue, chest discomfort, dizziness, weight change, or persistent inflammation signs. Immediate medical care is important for severe symptoms, not just abnormal numbers in isolation.
A practical retesting cadence for AST:ALT Ratio is every 8 to 12 weeks after major lifestyle, nutrition, or medication changes, and every 3 to 6 months for stable long-term tracking. Faster cadence is useful when values are clearly abnormal, while maintenance cadence helps confirm durability once results stabilize.
You can compare Essential ($99), Advanced ($199), and Max ($399) plans during checkout to confirm AST:ALT Ratio inclusion before purchasing. If AST:ALT Ratio is not in your selected tier, you can upgrade plans or add targeted testing so your panel matches your goals, symptoms, and retesting strategy.
AST:ALT Ratio is included in our comprehensive biomarker panels, processed at CLIA-certified Quest Diagnostics locations nationwide.
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Medical Disclaimer: This content is for educational and informational purposes only. It is not intended as medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with any questions about a medical condition or treatment. Do not disregard professional medical advice or delay seeking it because of information presented here.