Test library
Alanine Aminotransferase Test
The ALT blood test measures alanine aminotransferase, a liver enzyme that can rise when liver cells are irritated or damaged. It is one of the most common single liver markers and is often combined with other tests.
Order ALT Blood Test (SGPT) for Liver
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Order ALT Blood Test (SGPT) for Liver- Typical turnaround
- 1-3 business days
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- From $29
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Quick answer
The ALT Blood Test measures alanine aminotransferase, an enzyme found mainly inside liver cells. When those cells are irritated or injured, ALT can leak into the bloodstream, so the test acts as a sensitive early signal of liver involvement. Because ALT is not specific to one cause, it is usually interpreted with other liver markers and the person's medical history. The test is ordered for screening, monitoring, and follow-up of abnormal results.
What this test measures
Alanine aminotransferase (ALT), also called SGPT, is an enzyme concentrated in the liver. It participates in normal amino acid metabolism, and its level in blood is normally low. When liver cells are stressed or damaged, ALT escapes into circulation, and the measured level can rise above the reference range. The degree of elevation does not identify a specific cause, but it guides further evaluation.
The test requires a standard blood draw from a vein. Some laboratories measure ALT alone, while others report it as part of a liver panel that also includes AST, alkaline phosphatase, bilirubin, albumin, and total protein. Elevated ALT can also occur after intense exercise or muscle injury, so the broader clinical context matters when a result is interpreted.
People may be tested during a routine checkup, before or while taking a medicine that can affect the liver, or when they have symptoms such as fatigue, nausea, abdominal discomfort, or jaundice. The result is a clue rather than a diagnosis, and a qualified healthcare provider decides whether repeat testing, imaging, or other investigations are appropriate.
- Alanine aminotransferase (ALT)
- Aspartate aminotransferase (AST) when included
- Alkaline phosphatase (ALP) when included
- Gamma-glutamyl transferase (GGT) when included
- Total bilirubin when included
- Direct bilirubin when included
- Albumin when included
- Total protein when included
Why people order this test
- Check liver health during a routine evaluation
- Follow up on symptoms that may point to the liver
- Monitor liver enzymes while taking certain medicines
- Investigate an abnormal liver result from another panel
- Track a known liver condition over time
How to prepare
Fasting is not routinely required for an ALT test, but follow the laboratory's instructions. Strenuous exercise in the day before collection can raise the level, so mention recent intense activity to the collection staff.
Understanding your results
Results are typically available within one to three business days. A value above the reference range suggests liver cell irritation, but it does not reveal the cause. A qualified healthcare provider interprets it with other liver tests and the person's history.
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Frequently Asked Questions
What is the difference between ALT and AST?
Both are enzymes that can rise with liver cell irritation. ALT is more specific to the liver, while AST is also found in muscle and other tissues.
Can exercise affect an ALT result?
Yes. Strenuous exercise or muscle injury can raise ALT, so it helps to mention recent intense activity when the sample is collected.
Does a high ALT mean I have liver disease?
Not necessarily. Many situations can raise ALT, including temporary illness, medicines, alcohol use, and fatty liver. A provider determines the likely cause.
Is fasting required for the ALT test?
Fasting is not usually required when ALT is measured alone, but follow the instructions on the laboratory order for your appointment.
Why is ALT sometimes called SGPT?
SGPT stands for serum glutamic-pyruvic transaminase, an older name for the same enzyme. Both names refer to the same test.
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