Aspartate Aminotransferase (AST/SGOT)
AST is an enzyme found in the liver, heart, and muscles. Elevated levels may signal liver disease, heart problems, or muscle injury. It is often tested alongside ALT for a more complete liver assessment.
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What the Aspartate Aminotransferase (AST/SGOT) test tells you
Aspartate aminotransferase, historically abbreviated SGOT, is an enzyme involved in amino acid metabolism. Unlike its partner ALT, it is not concentrated in the liver alone: substantial amounts sit in heart muscle, skeletal muscle, the kidneys and red blood cells. Any of those tissues can release it when damaged, which makes AST a broader signal of cell injury and a less liver-specific one.
That breadth is exactly why AST is measured together with ALT rather than instead of it. Comparing the two lets your doctor infer where the enzyme is likely coming from and, within liver disease, which process is more probable. Alcohol-related liver injury tends to push AST proportionally higher than ALT, while metabolic fatty liver more often shows the reverse pattern, and advancing fibrosis can shift the balance again. None of this is diagnostic on its own: it is a clue that shapes what your doctor investigates next.
Outside the liver, AST frequently rises for reasons that have nothing to do with it. Intense or unaccustomed exercise, particularly heavy resistance training, releases enzyme from skeletal muscle for several days. So does muscle injury, an intramuscular injection, a seizure, or a muscle-related side effect of some cholesterol medicines. Even the blood sample itself can be responsible: if red cells break during a difficult draw, AST leaks out of them and the reported value rises without anything being wrong with you. Your doctor weighs all of this before deciding whether a raised AST needs pursuing.
Part of standard liver function panels. Also useful for evaluating myocardial injury, rhabdomyolysis, or haemolytic anaemia.
- Complete the liver picture
AST measured next to ALT gives your doctor a pattern to read rather than a single figure, which narrows the likely cause of liver enzyme elevation.
- Detect muscle involvement
Because skeletal and cardiac muscle contain AST, the test can reveal muscle injury that would otherwise be missed on a routine screen.
- Monitor known liver disease
In established liver conditions, tracking AST over time helps show whether the process is settling, stable or progressing.
- Check medication tolerance
Some medicines affect the liver, muscle or both, and AST is part of the routine safety monitoring used while taking them.
Reasons your doctor may request the Aspartate Aminotransferase (AST/SGOT) test
Your doctor may order this test for any of the reasons below. Some are routine checks, others follow specific symptoms or an earlier result.
Routine liver screening
- Routine liver function screening or a general health check.
Liver & muscle symptoms
- Fatigue, nausea, poor appetite or discomfort under the right ribs.
- Yellowing of the eyes or skin, or unusually dark urine.
- Muscle pain or weakness, particularly while taking cholesterol-lowering medication.
Known liver disease & medication
- Known liver disease, regular alcohol use, or a positive hepatitis result being followed up.
- Monitoring during treatment with a medicine known to affect the liver.
A result in the Normal band, up to 40 U/L, is the usual finding. AST is found in the liver, heart, skeletal muscle and red cells, so it is less specific to the liver than ALT. A result in the Mildly raised band, 41 to 120 U/L, can come from fatty liver, alcohol, medicines, a recent hard workout or muscle injury, or red cells breaking down in the sample tube. A result in the High band, above 120 U/L, suggests more active injury to the liver or muscle and should be discussed with your doctor. Doctors compare it with ALT: AST clearly higher than ALT, especially twice as high or more, raises the question of alcohol-related liver disease or a muscle source, while ALT higher than AST is more typical of fatty liver and viral hepatitis. It is read alongside your other liver tests, CK when muscle is suspected, your symptoms and history.
Medically reviewed by Dr Nirupama Sabhapathy
Ranges are a guide: your physician interprets your result alongside your symptoms and history.
What a higher result can point to
- Liver conditions including fatty liver disease, viral hepatitis and drug-related liver injury.
- Alcohol, which characteristically raises AST more than ALT.
- Skeletal muscle injury, strenuous or unaccustomed exercise, or an intramuscular injection.
- Heart muscle damage, which releases AST along with more specific cardiac markers.
- Breakdown of red blood cells, whether inside the body or within the sample tube after a difficult draw.
- Thyroid disease and coeliac disease, both of which can raise transaminases without liver symptoms.
These are possibilities, not diagnoses. A single value outside the reference range is interpreted alongside your symptoms, history and other tests: your doctor decides what it means for you.
What this test cannot tell you
- AST is present in several tissues, so a raised result does not confirm that the liver is the source.
- A difficult blood draw that damages red cells can raise the reported value artificially.
- Normal AST does not exclude significant liver disease, since advanced scarring often runs with unremarkable enzymes.
- Recent exercise is a frequent and easily overlooked reason for an elevation in an otherwise healthy person.
Risks of the blood draw
- Mild bruising or brief soreness where the needle went in.
- Occasional lightheadedness, which settles after a few minutes of rest.
- Bleeding or infection at the site, which is rare with sterile single-use equipment.
- 1AST is found in liver, heart, skeletal muscle, kidney and red blood cells.
- 2It is almost always interpreted alongside ALT rather than on its own.
- 3The relationship between AST and ALT offers a clue to the underlying cause.
- 4Exercise, muscle injury and haemolysis of the sample are common non-liver explanations.
- 5A low result has no established clinical significance.
Aspartate Aminotransferase (AST/SGOT) is also part of these health checkups, which add a wider screen in the same appointment.
Aspartate Aminotransferase (AST/SGOT) also comes in these focused packages, which pair it with the tests usually read alongside it.
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Frequently Asked Questions
Everything you need to know about the Aspartate Aminotransferase (AST/SGOT) test. Can't find what you're looking for?
Talk to our team→Our laboratory reports up to 40 U/L as normal. A result of 41 to 120 U/L is reported as mildly raised and is usually repeated, while a result above 120 U/L is reported as high and suggests more active injury to the liver or muscle that should be discussed with your doctor.
A mildly raised AST, 41 to 120 U/L, is common and often has an everyday explanation: fatty liver, alcohol, a medicine, a recent hard workout or muscle injury, or red cells breaking down in the sample tube. It is usually repeated after the likely cause has been removed, and read with ALT and the rest of your liver tests.
Yes. AST is also found in skeletal muscle, heart muscle, kidney and red blood cells, so muscle injury, an intramuscular injection, heart muscle damage or breakdown of red cells can all raise it. Thyroid disease and coeliac disease can raise it without liver symptoms too. This is why a raised AST alone does not confirm the liver is the source.
Yes. Drug-related liver injury is one of the recognised causes of a raised AST, and the team asks about cholesterol-lowering treatment and gym products for this reason. Bring a full list of your medicines and supplements to the test. Your doctor decides whether anything should change; do not stop a prescribed medicine on the strength of one result.
AST is almost always read with ALT, and usually as part of a wider liver panel. When a muscle source is suspected, for example after heavy exercise or an injury, your doctor may add CK, the main muscle enzyme. If the liver is the likely source, further liver tests or imaging may follow.
Skeletal muscle contains a large amount of this enzyme, and intense or unaccustomed exercise causes microscopic muscle damage that releases it into the blood. The rise can last several days, which is why avoiding heavy training before the test is worth doing.
The balance between them hints at where the enzyme is coming from and which liver process is most likely. Alcohol-related injury tends to shift the balance one way and metabolic fatty liver the other. It is a directional clue rather than a diagnosis.
Yes. Red blood cells contain AST, so if some of them break during collection the enzyme is released into the sample and the reported level rises. Laboratories flag samples where this has happened, and a repeat draw usually resolves the question.
Not necessarily. Enzyme levels reflect ongoing cell injury, so they can be entirely ordinary in stable or advanced liver disease where fewer cells remain to leak. Your doctor may use imaging or fibrosis assessment where the clinical suspicion is real.
No, AST on its own does not require fasting, but follow any instruction for the wider panel it is part of. Avoid strenuous exercise, especially heavy weight training, for a day or two before the sample.
The AST test is AED 15, including a physician-reviewed report, with results usually within 24 hours. Home collection anywhere in Dubai is free when your order reaches AED 300 or includes a package; below that, a AED 100 home collection fee applies (AED 50 for a lab walk-in).