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2026 Update: The AST:ALT ratio remains one of the most clinically useful low-cost indicators for figuring out if you have metabolic liver stress from alcohol or other conditions. You can test liver enzymes at home then measure the results with our AST:ALT Ratio Calculator.
The AST:ALT ratio is one of the most useful tools for interpreting liver enzyme results. Also known as the De Ritis ratio, this calculation has been used since 1957 to help differentiate between types of liver disease.
While individual AST and ALT numbers tell part of the story, the ratio between them often reveals more about what may be happening inside your liver.
Test seven key liver health markers from home with a simple finger-prick blood test. No appointment is required.
The Choose Health Liver Function Test measures seven liver health markers, including AST and ALT, and automatically calculates your AST:ALT ratio.
At one point, you would have had to schedule an appointment with a physician, pay a co-pay for the visit, get a doctor’s recommendation, go to a lab for a blood draw and then wait for results that may not include an interpretation.
You can still do all of that, or you can order an at-home liver test from a provider like Choose Health. Many people who are curious about their liver health choose to test at home because it can provide valuable information to help them understand whether further care may be needed.
Need to get your AST:ALT ratio numbers? Choose Health offers two liver tests that include AST and ALT and provide your calculated AST:ALT ratio.
Use the calculator below to calculate your AST:ALT ratio and see how your result compares with commonly used interpretation ranges.
For example, if your AST is 32 U/L and your ALT is 45 U/L: 32 ÷ 45 = 0.71.
That ratio of 0.71 falls within the below-one range.
| AST (U/L) | ALT (U/L) | AST:ALT Ratio | Interpretation |
|---|---|---|---|
| 32 | 45 | 0.71 | Below 1 |
| 50 | 50 | 1.0 | Around 1 |
| 90 | 40 | 2.25 | Above 2 |
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Knowing your ratio is only useful if you understand what the result may indicate. The table below shows commonly used AST:ALT ratio classifications and patterns associated with each range.
| AST:ALT Ratio | Classification | Common Associations |
|---|---|---|
| Less than 1 | Below 1 | Common in healthy results and metabolic-related liver patterns |
| Around 1 | Borderline | May occur with metabolic dysfunction, illness or medication effects |
| 1.0-2.0 | Elevated | May occur with liver stress, alcohol use, medications or advanced changes |
| Greater than 2.0 | Highly elevated | Can be associated with alcohol-related liver stress, especially when GGT is elevated |
A ratio below 1 means your ALT is higher than your AST. This pattern can occur with metabolic-related liver stress, including metabolic dysfunction-associated steatotic liver disease, insulin resistance or medication effects. Many people with early-stage liver concerns fall into this category.
When AST and ALT are roughly equal, the pattern may occur with metabolic dysfunction, insulin resistance, acute viral hepatitis or drug-related liver toxicity. Results should be interpreted alongside the individual enzyme values and other liver markers.
A ratio in this range may indicate liver stress beyond a simple metabolic pattern. It can also be influenced by alcohol use, medications, muscle stress or recent intense exercise. Learn more about what happens to your liver after 30 days without alcohol .
A ratio greater than 2, where AST is more than double ALT, is commonly associated with alcohol-related liver stress. This pattern becomes more meaningful when GGT is also elevated and should be discussed with a healthcare provider.
Looking at AST or ALT alone can be misleading. Measuring the two against one another provides additional context.
Someone with an AST of 60 and ALT of 80 has a ratio of 0.75, which may point toward metabolic causes. Someone else with an AST of 60 and ALT of 25 has a ratio of 2.4, which may point toward alcohol-related stress, despite having the same AST value.
The ratio can also help track whether liver stress appears to be improving or progressing. A ratio moving from 1.5 toward 0.8 over several months may suggest improvement, while a ratio moving from 0.9 toward 1.5 may warrant a closer review of the individual enzyme values and contributing factors.
Anyone can gain information from monitoring liver enzymes, but calculating and tracking the ratio may be especially useful if you:
Monitoring your ratio over time can provide context across all of these situations.
Test seven liver health markers from home and receive your calculated AST:ALT ratio in your Choose Health dashboard.
One at-home liver enzyme test provides a snapshot. Follow-up testing can help you see whether changes in alcohol intake, nutrition, exercise, medications or other factors are affecting your results.
Acute stress, dehydration and recent intense exercise can temporarily affect AST or ALT, which is another reason trends may be more useful than a single result.
| Testing Goal | Recommended Frequency | When This Applies |
|---|---|---|
| Reducing alcohol | Every 2-4 weeks | If you are reducing alcohol intake and want to monitor recovery signals. |
| MASLD dietary changes | Every 4-8 weeks | If you are making dietary or lifestyle changes and want to track your results. |
| Regular monitoring | Every 3-6 months | If values are mildly elevated but stable and you want ongoing visibility. |
| Baseline tracking | Annually | If results are in range and you want to monitor them over time. |
GGT, or gamma-glutamyl transferase, adds another layer to AST:ALT ratio interpretation. Combining the ratio with GGT can provide a more complete view of liver health.
GGT is an enzyme produced primarily in the liver. It helps support the metabolism of medications and other substances. Measuring GGT can help evaluate liver function and provide more context around elevated AST or ALT. For a deeper explanation of AST and the factors that can affect it, read AST Blood Test (SGOT): What It Is and What Your Results Mean .
An AST:ALT ratio above 2 with elevated GGT is more consistent with alcohol-related liver stress. The same ratio with normal GGT may point toward other causes, including muscle injury affecting AST.
People using GLP-1 medications such as semaglutide or tirzepatide may choose to track liver enzymes during their weight-loss journey. Rapid fat loss can temporarily shift ALT and AST as the liver adapts metabolically.
In many people with MASLD, liver markers may improve over time alongside changes in visceral fat and insulin resistance. Tracking the AST:ALT ratio can provide another data point for monitoring how ALT and AST change over time.
Learn more about GLP-1 medications and the liver enzymes worth monitoring .
For a broader overview of metabolic, kidney, liver and pancreatic monitoring, read what blood tests to monitor while taking Ozempic, Wegovy or Mounjaro .
Choose Health offers at-home liver function tests that measure AST, ALT and GGT together. Testing from home allows you to:
Choose Health results include your calculated AST:ALT ratio, personalized insights based on your enzyme patterns and tools for comparing results over time.
Your next step depends on your ratio, your individual AST and ALT values, your other liver markers and your health history.
This pattern is common when AST and ALT are within range, although it can also appear with early metabolic-related liver changes.
This can occur temporarily with illness or medication use and may also appear with metabolic dysfunction or MASLD.
Alcohol use, medications, metabolic health, liver stress and recent intense exercise can all affect this range.
This pattern may indicate significant liver stress, particularly when GGT or the individual enzyme values are also elevated.
Retesting is where the AST:ALT ratio becomes most useful. Comparing your results over time can help you see whether changes in lifestyle, alcohol intake, medications or metabolic health are affecting your liver markers.
Order your next panel now so it is ready when you reach your recommended retesting window.
Retest the core liver markers needed to monitor your AST, ALT and calculated AST:ALT ratio.
Your first liver test can show that something changed. The Comprehensive Liver Function Test adds metabolic, cholesterol and iron markers that may provide a fuller picture.
Still comparing your options? See how Choose Health compares with other at-home liver tests .
Haven’t tested yet and still unsure which liver test fits your goals?
Take the Liver Health QuizChoose Health tests provide health information and are not a substitute for medical advice, diagnosis or treatment. Discuss significantly elevated liver enzymes, an AST:ALT ratio above 2, persistent symptoms or other abnormal results with a qualified healthcare professional. Promotional eligibility and terms may apply to coupon codes LIVER15 and LIVER30.
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| AST:ALT Ratio | What It May Mean | Recommended Next Step |
|---|---|---|
| Below 1 | Typically associated with healthy liver function when AST and ALT are within normal ranges. | Continue healthy habits and monitor annually as part of your routine health testing. |
| Around 1 | Can occur temporarily from illness or medication use. May also be an early sign of metabolic dysfunction or MASLD. | Retest in 1 month. If the ratio remains elevated, focus on nutrition, exercise, and metabolic health. |
| 1-2 | May reflect alcohol use, medications, metabolic health concerns, liver stress, or recent intense exercise. | Review potential contributing factors and retest in 4-8 weeks after making lifestyle changes. |
| Above 2 | More concerning pattern that may indicate significant liver injury or alcohol-related liver disease. | Discuss results with a healthcare provider and consider additional testing or evaluation. |
A ratio below 1.0 is considered optimal. This means ALT is higher than AST, which is the typical pattern in a healthy liver or early-stage metabolic stress. Ratios above 1.0 suggest more significant liver involvement and warrant closer attention.
A ratio above 2 strongly suggests alcohol-related liver disease, especially when GGT is also elevated. Other causes, including muscle damage, can sometimes produce a high ratio, which is why GGT is an important third marker to review alongside AST and ALT.
Yes. Intense physical activity can raise AST because AST is found in muscle tissue, not just the liver. A high-intensity workout before testing can temporarily push the ratio above 1.0. Retesting after a few days of rest can help clarify whether exercise was the cause.
This is a common pattern in metabolic liver stress, including MASLD and insulin resistance. ALT often rises more than AST in metabolic contexts. This pattern can respond well to lifestyle changes and is generally considered more reversible than high-ratio patterns.
ALT is more liver-specific, making it a more direct marker of liver cell stress. AST is also found in muscle and heart tissue, so it is less specific on its own. The ratio between AST and ALT provides more context than either value alone.
The ratio can shift within 2 to 4 weeks if the underlying cause is addressed. Alcohol-related changes may improve within the first month, while metabolic causes may take 4 to 12 weeks to show meaningful changes.
A very low ratio, below 0.5, is not usually a clinical concern on its own. It often means ALT is elevated relative to AST, which may point toward metabolic or medication-related liver stress. If both AST and ALT are normal, the ratio has limited diagnostic significance.
No. A ratio above 2 is a strong signal for alcohol-related liver disease, but it is not diagnostic on its own. Muscle injury, myocarditis, and certain medications can also raise AST more than ALT. A high ratio with elevated GGT is a stronger signal for alcohol-related liver stress.
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