Ast Test

The AST (Aspartate Aminotransferase) test is a blood test used to measure the level of aspartate aminotransferase, an enzyme found in various tissues throughout the body, including the liver, heart, muscles, and kidneys.

Purpose of the Test

The AST test is typically ordered to:

• Assess liver damage or disease, such as hepatitis or cirrhosis
• Evaluate the effectiveness of treatment for liver disease
• Monitor patients with a history of liver disease
• Help diagnose conditions that affect other parts of the body, such as the heart or muscles

How the Test is Performed

A blood sample is drawn from a vein in the arm using a needle and collected into a tube. The sample is then sent to a laboratory for analysis.

Interpretation of Results

The normal range for AST levels varies depending on the laboratory and the individual's age, sex, and other factors. Generally, the normal range is:

• 0-40 units per liter (U/L) for adults
• 0-50 U/L for children

Elevated AST levels may indicate liver damage or disease, while very high levels can indicate severe liver damage or other conditions such as heart attack or muscle damage.

Risk Factors and Precautions

Certain medications, such as statins and some antibiotics, can affect AST levels. It is essential to inform the doctor about any medications being taken before undergoing the test.

Related Tests

The AST test is often performed in conjunction with other tests, including:

• ALT (Alanine Aminotransferase) test
• Alkaline phosphatase test
• Bilirubin test
• Liver function tests (LFTs)

Limitations and Considerations

The AST test has some limitations, including:

• It is not specific to liver disease and can be elevated in other conditions
• It may not detect mild liver damage or early stages of liver disease

Frequently Asked Questions (FAQs)

What is an AST test?
A blood test that measures aspartate aminotransferase enzyme levels.

Why is an AST test ordered?
To diagnose liver damage or disease.

What does high AST level indicate?
Liver damage, heart attack, or muscle damage.

How is the AST test performed?
A blood sample is drawn from a vein.

Is fasting required for an AST test?
No, but may be required for other tests done at same time.

What are normal AST levels?
Vary by lab, but typically 0-40 units per liter.

Can AST levels be low?
Yes, but it is not usually a cause for concern.

Are there any risks to an AST test?
Minor risks of bleeding or bruising at needle site.

How long does it usually take to get AST test results?
Typically 1-2 days, depending on lab processing time.

What should I do if my AST level is high?
Consult with a doctor to determine next steps.