What this test measures
SGOT (Serum Glutamic-Oxaloacetic Transaminase), now usually called AST (Aspartate Transaminase), is an enzyme found in liver, heart muscle, skeletal muscle, kidneys, brain and red blood cells. It rises when any of these tissues are injured — so it is less liver-specific than SGPT. The diagnostic power comes from interpreting it together with SGPT (the AST/ALT ratio) and the clinical context.
Why it matters
SGOT is part of every Liver Function Test. The most clinically useful interpretation is the SGOT/SGPT ratio: ratio > 2 with SGPT < 300 strongly suggests alcoholic liver disease; ratio < 1 favours fatty liver or chronic viral hepatitis; both very high together points to acute hepatocellular injury. SGOT also rises in muscle injury (vigorous exercise, rhabdomyolysis, recent intramuscular injections), recent myocardial infarction, and haemolysis — so an isolated SGOT rise without SGPT or bilirubin change should prompt checking for these non-hepatic sources.
How to prepare
Fasting preferred when bundled with other tests, not strictly required for SGOT alone. Avoid alcohol for 24 hours before the test. Avoid vigorous exercise in the 24 hours before — muscle SGOT can transiently raise the serum level. Mention all medications (statins, anti-TB drugs, methotrexate, paracetamol, herbal supplements).
Markers & reference ranges
Reference ranges below are typical adult values. Your lab's reported range may differ slightly based on the assay platform and patient demographics — always read your report against the range printed on it.
| Marker | Normal range | If low | If high |
|---|---|---|---|
| SGOT (AST) (U/L)[1][2] | < 40 | Low SGOT is not clinically meaningful. | Often parallels SGPT (ALT). AST/ALT > 2 with ALT < 300 → alcoholic liver disease. AST/ALT < 1 with mild rises → fatty liver / chronic hepatitis. Marked isolated AST rise (with normal ALT) → muscle source (rhabdomyolysis, intense exercise), recent myocardial infarction, or haemolysis (false rise from cell breakdown). |
AST / ALT ratio interpretation
| Pattern | AST/ALT ratio | Likely cause |
|---|---|---|
| Both mildly raised, AST < ALT | < 1 | Fatty liver / NAFLD, chronic viral hepatitis (B / C) |
| Both raised, AST roughly = ALT | ~ 1 | Acute viral hepatitis, drug-induced liver injury, autoimmune hepatitis |
| Both raised, AST > 2× ALT (with ALT usually < 300) | > 2 | Alcoholic liver disease — classic ratio |
| AST very high, ALT normal | Very high ratio | Muscle injury (rhabdomyolysis, exercise), MI, haemolysis — not liver |
| Both > 10× upper limit | ~ 1 | Acute severe hepatitis, paracetamol overdose, ischaemic hepatitis |
Frequently asked questions
What is the difference between SGOT and SGPT?
SGPT (ALT) is concentrated in the liver and is the more liver-specific marker. SGOT (AST) is in liver, heart muscle, skeletal muscle, kidneys and red blood cells — less specific but useful in the ratio with SGPT to identify the cause of a rise.
My SGOT is high but SGPT is normal — what does that mean?
An isolated SGOT rise with normal SGPT usually points to a non-liver source: muscle injury (rhabdomyolysis, vigorous exercise, recent intramuscular injections), recent myocardial infarction, or haemolysis. Your doctor will check for these — a CK (creatine kinase) is useful for muscle source, and the clinical picture for cardiac.
Why is the AST/ALT ratio important?
The ratio distinguishes common patterns: AST/ALT > 2 with ALT < 300 strongly suggests alcoholic liver disease; ratio < 1 favours fatty liver or chronic viral hepatitis; both very high together suggests acute hepatocellular injury. Pattern matters as much as absolute values.
Do I need to fast for SGOT?
Fasting is preferred if SGOT is part of a bundled fasting panel. Avoid alcohol for 24 hours and vigorous exercise in the 24 hours before.
Can a gym session raise SGOT?
Yes — heavy weight training in the 24–48 hours before a blood test can raise SGOT (and creatine kinase) due to skeletal muscle leakage. Schedule the test on a rest day.
How often should I check SGOT?
As part of an annual Liver Function Test for adults with diabetes, obesity, hypertension, family history of liver disease, regular alcohol use, or hepatitis B / C. More often if on a hepatotoxic medication.
Should I do SGOT alone or a full LFT?
A full LFT (SGPT + SGOT + ALP + GGT + bilirubin + albumin + total protein) is the standard. Standalone SGOT alone is rarely useful — it is the SGPT pairing and the ratio that informs the diagnosis.
Related Liver / Enzymes tests
Tests commonly ordered alongside ASPARTATE AMINOTRANSFERASE (SGOT), or that help interpret an unexpected result.
Sources & references
- AASLD Practice Guidance — Abnormal Liver Chemistries (2017) · accessed 2026-05-29T00:00:00.000Z
- NIH MedlinePlus — AST Blood Test · accessed 2026-05-29T00:00:00.000Z
- NCBI StatPearls — Aspartate Aminotransferase · accessed 2026-05-29T00:00:00.000Z
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