AST ALT Ratio Calculator

Written by Great Medico

Updated September 24, 2026 •2 min read

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Liver and GI risk tools often combine familiar labs in ways that are not intuitive at a glance. AST ALT Ratio Calculator makes that relationship explicit and returns the exact index or score implemented in this calculator.

What this calculator does

AST ALT Ratio Calculator uses AST and ALT to produce the ast/alt ratio used by this calculator. It only uses the fields shown in this calculator; it does not silently add tests, diagnoses, symptoms, or clinical variables that are absent from the interface. Uses standard health-calculator relationships where a stable equation exists; complex or policy-dependent tools expose assumptions/points so the result can be checked against the current clinical or public-health source.

How to use it

Enter or select AST and ALT. Keep laboratory units consistent and use values from the clinical time point required by the named model. If an input is unknown, it is better to leave the calculation unresolved than to invent a value.

How the calculation works

The AST/ALT ratio is AST divided by ALT. Both enzymes must be entered in compatible units from the same clinical context.

Example

Using the calculator’s prefilled demonstration values, the primary output is 1.33, labeled “AST/ALT ratio”; AST is 80 U/L and ALT is 60 U/L. That sample is useful for checking the calculation path, but real interpretation should use verified measurements from the same clinical or study context.

How to interpret the result

Read ast/alt ratio as the result of the named liver/GI model. Use it for the population and purpose in which the model was validated, and avoid interpreting the number as a stand-alone diagnosis, prognosis, or treatment indication.

Limitations and notes

Cutoffs can differ by disease population and guideline, and lab values can change quickly with treatment or acute illness. Use trends, the correct indication, and confirmatory testing or specialist assessment when the result could change management.