alt ast calculator - Aaron Graves, PhDude Replica

ALT/AST Ratio Calculator (De Ritis Ratio)

Enter your liver enzyme values in U/L. This tool calculates the AST/ALT ratio and provides a general interpretation.

What is the ALT/AST ratio?

The ALT AST ratio calculator estimates the De Ritis ratio, which is:

AST ÷ ALT

AST and ALT are liver enzymes often measured in a liver function panel. While both can rise in liver injury, the ratio between them can add context when your clinician evaluates lab results.

How to use this calculator

Get your ALT and AST values from your lab report.
Enter both numbers exactly as listed (usually in U/L).
Click Calculate to see the ratio and an interpretation.

Formula used

This page uses a straightforward formula:

AST/ALT ratio = AST value / ALT value

Example: if AST = 40 and ALT = 50, ratio = 40/50 = 0.80.

How to interpret the AST/ALT ratio

Interpretation should always be combined with your full clinical picture, symptoms, medications, alcohol use, and other labs (bilirubin, ALP, GGT, platelets, INR, albumin, and imaging findings).

Less than 1.0: often seen when ALT is relatively higher than AST.
Around 1.0: mixed pattern; may be nonspecific.
Greater than 1.0: AST is relatively higher than ALT.
Greater than 2.0: can be associated with alcohol-related liver injury, but is not diagnostic on its own.

Important: A ratio alone cannot diagnose liver disease. A normal ratio does not always mean normal liver health, and an abnormal ratio does not automatically indicate severe disease.

Typical reference ranges (general)

Reference limits vary slightly by laboratory, but common adult ranges are:

ALT: about 7 to 56 U/L
AST: about 10 to 40 U/L

Your lab’s printed reference range should be considered the primary standard.

What can affect ALT and AST values?

Common contributors

Fatty liver (metabolic dysfunction-associated steatotic liver disease)
Alcohol intake
Viral hepatitis
Medication effects (including OTC and supplements)
Muscle injury or intense exercise (can raise AST)
Hemolysis and sample handling factors

Why trend data matters

Single values are helpful, but trends across time are often more informative. Rising or persistent elevations may trigger additional workup, while improving trends can indicate recovery.

When to seek medical care

Contact a healthcare professional if:

you have persistently abnormal liver tests,
you develop jaundice, dark urine, severe fatigue, abdominal pain, or confusion,
you have a history of chronic liver disease and labs worsen unexpectedly.

Quick FAQ

Is this a liver disease diagnosis tool?

No. This is a ratio calculator for education and discussion. Clinical diagnosis requires full medical evaluation.

Can I use this as a hepatitis calculator?

Not directly. The ALT/AST ratio is one data point and cannot confirm hepatitis subtype or severity by itself.

Does a high AST/ALT ratio always mean alcohol-related liver disease?

No. It may occur in several conditions. Only a clinician can interpret the result in context.