SGPT (ALT) vs SGOT (AST): what's the difference?
Educational — not medical advice · Ranges vary between laboratories
The short answer: Both are enzymes that leak into the blood when cells are stressed, but SGPT (ALT) is the more liver-specific of the two. SGOT (AST) also comes from muscle and heart tissue, so a raised SGOT with a normal SGPT often points away from the liver — recent hard exercise is a common explanation.
SGPT lives inside liver cells. When those cells are stressed or damaged, the enzyme leaks into your blood — so a rising SGPT is your liver's early signal, usually long before you feel anything.
Full SGPT (ALT) guideSGOT is less liver-specific than SGPT — muscle and heart tissue release it too. That's why doctors interpret it alongside SGPT rather than alone.
Full SGOT (AST) guideAt a glance
| SGPT (ALT) | SGOT (AST) | |
|---|---|---|
| Panel | Liver panel | Liver panel |
| Unit | U/L | U/L |
| Typical adult range | Normal 7–56 U/L | Normal 5–40 U/L |
| Also known as | ALT, SGPT, Alanine Aminotransferase | AST, SGOT, Aspartate Aminotransferase |
General adult reference intervals — your lab's printed range takes precedence.
Why they're often tested together
Liver panels almost always report the pair, because the pattern carries more information than either number alone. When both rise together, the liver is the usual source; when only SGOT moves, muscle is worth considering. Doctors also look at the SGOT-to-SGPT ratio itself, which carries information of its own.
Questions people ask
My SGOT is high but SGPT is normal — what does that suggest?
That pattern often points away from the liver. Because SGOT also comes from muscle and heart tissue, recent intense exercise or muscle strain is a common explanation. A repeat test after a few rest days usually clarifies it, and it's worth mentioning to your doctor.
Do both have to be abnormal for the liver to be involved?
Not necessarily, but liver causes such as fatty liver, medicines, alcohol, or hepatitis typically move both. A mild rise in SGPT alone is common and often reversible. Doctors read the size of the rise and the trend across tests rather than a single value.
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