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Finding the right tests…
Biochemistry
SGPT and SGOT — better known today as ALT and AST — are usually read as two separate numbers, but the ratio between them, AST divided by ALT, carries its own separate meaning known clinically as the De Ritis ratio. Two people can have the exact same AST reading and still have very different ratios depending on their ALT, and it's that ratio, not either enzyme alone, that leans a doctor toward one pattern of liver injury over another. A ratio under 1, where ALT is higher, is the pattern typically seen in viral hepatitis. A ratio of 2 or higher, where AST runs well ahead of ALT, leans toward alcohol-related liver damage instead.
The ratio is calculated by dividing your AST (SGOT) result by your ALT (SGPT) result from the same blood sample — no separate draw is needed beyond the two enzyme tests you already have. A ratio below 1 means ALT is the higher of the two, a pattern more typical of viral hepatitis. A ratio of 2 or above means AST is running well ahead of ALT, a pattern more typical of alcohol-related liver disease. Values in between are read alongside the rest of your liver panel rather than taken as a clear signal on their own.
The ratio earns its place because AST and ALT don't behave identically across every kind of liver injury, even when both are raised. In viral hepatitis, ALT tends to rise more than AST, pulling the ratio below 1. In alcohol-related liver disease, the pattern reverses — AST rises disproportionately more than ALT, and a ratio of 2 or higher is considered suggestive of alcohol as a contributing cause, on top of whatever the individual enzyme levels already show.
Beyond distinguishing viral from alcohol-related injury, research has looked at the AST/ALT ratio as a broader marker of liver disease severity — a persistently elevated ratio has been associated with more advanced scarring (fibrosis) in some chronic liver conditions, and has also been studied as a general marker of illness severity in conditions unrelated to the liver, including some cancers and critical illness, though those uses sit outside routine liver testing.
Because the ratio is calculated rather than drawn separately, it needs nothing beyond the AST and ALT tests already being done — no extra sample, no extra preparation. It's also not read in isolation: a ratio is only as informative as the two numbers behind it, so your doctor will usually weigh it alongside bilirubin, alkaline phosphatase, and your symptoms rather than as a standalone verdict.
It's AST (SGOT) divided by ALT (SGPT), using results from the same blood sample. No separate test is needed — it's a calculation done from the two enzyme values you already have.
It means ALT (SGPT) is higher than AST (SGOT), a pattern more typically seen in viral hepatitis than in other causes of liver injury.
It means AST (SGOT) is running well ahead of ALT (SGPT), a pattern considered suggestive of alcohol-related liver disease when read alongside the rest of your results.
It adds a different kind of information. Two people can have the same AST level and very different ratios depending on ALT, and that relationship — not either number by itself — is what points toward a specific pattern of liver injury.
This page is general information about the test, not medical advice. Your own report's reference ranges apply — please discuss your results with your doctor.
No. It's a supporting clue, not a diagnosis. Your doctor weighs it alongside your history, other liver test results, and sometimes imaging before concluding anything.
No. It's calculated from your existing AST and ALT results, so there's nothing extra to collect and no separate preparation involved.