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Glutamate Oxaloacetate Transaminase (GOT) - Overview

Glutamate oxaloacetate transaminase (GOT), also known as aspartate aminotransferase (AST), is an enzyme found mainly in the liver, heart, and muscles. Elevated GOT levels in the blood can indicate cell damage in these organs.

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Things worth knowing about "Glutamate Oxaloacetate Transaminase"

Glutamate oxaloacetate transaminase (GOT), also known as aspartate aminotransferase (AST), is an enzyme found mainly in the liver, heart, and muscles. Elevated GOT levels in the blood can indicate cell damage in these organs.

What is Glutamate Oxaloacetate Transaminase (GOT)?

Glutamate oxaloacetate transaminase (GOT), also referred to as aspartate aminotransferase (AST) or ASAT, is an enzyme present in various body tissues. It plays a central role in amino acid metabolism by catalyzing the transfer of an amino group from aspartate to alpha-ketoglutarate, producing oxaloacetate and glutamate. GOT is one of the most important laboratory markers used in medical diagnostics, particularly for assessing liver and heart function.

Distribution in the Body

The GOT enzyme is found in numerous organs and tissues, but in varying concentrations:

Liver: highest concentration, especially in liver cells (hepatocytes)
Heart muscle: very high concentration, relevant in heart attacks
Skeletal muscle: high concentration, relevant in muscle diseases
Kidneys: moderate concentration
Brain: also detectable

Under normal conditions, only small amounts of GOT are found in the blood. A rise in serum GOT levels indicates damage or death of cells in one of these organs.

Clinical Significance and Diagnostics

Measurement of GOT in blood serum is a standard component of clinical laboratory diagnostics. It is used to:

Diagnose and monitor liver diseases (e.g., hepatitis, liver cirrhosis, fatty liver disease)
Detect heart muscle damage (e.g., myocardial infarction)
Investigate skeletal muscle disorders (e.g., myopathies, rhabdomyolysis)
Identify drug-induced liver injury
Monitor the course of liver diseases

Reference Values

Reference ranges may vary slightly depending on the laboratory and measurement method. General guidelines are:

Women: up to approximately 35 U/L (units per liter)
Men: up to approximately 40 U/L
Children: age-dependent, often slightly higher normal values

Values above these thresholds are considered elevated GOT and require further diagnostic evaluation.

Causes of Elevated GOT Levels

An elevated GOT level is not specific to a single disease but can occur in various conditions:

Liver Diseases

Acute or chronic hepatitis (viral, alcoholic, autoimmune)
Liver cirrhosis
Fatty liver disease (NAFLD/NASH)
Liver tumors or metastases
Drug- or toxin-induced liver damage

Heart Diseases

Myocardial infarction (heart attack): GOT rises within a few hours of the event and remains elevated for several days. Today, troponin is preferred as a more specific cardiac marker.
Myocarditis (inflammation of the heart muscle)

Muscle Diseases and Other Causes

Intense physical exercise or sports activity
Rhabdomyolysis (massive muscle breakdown)
Myopathies (muscle diseases)
Hemolysis (breakdown of red blood cells)
Kidney diseases
Thyroid disorders

Combination with Other Laboratory Values

To narrow down the cause of elevated GOT levels, GOT is typically assessed alongside other laboratory parameters:

GPT (glutamate pyruvate transaminase / ALT): Also a liver enzyme. The GOT/GPT ratio (De Ritis ratio) provides clues about the type of liver disease. A ratio below 1 suggests viral hepatitis, while a ratio above 2 points more toward alcoholic liver disease or cirrhosis.
Gamma-GT (GGT): Another liver enzyme whose elevation indicates liver disease, particularly alcohol-related damage.
Alkaline phosphatase (ALP): Further liver enzyme used to clarify the underlying cause.
Bilirubin: Reflects liver function and the breakdown of hemoglobin.
Troponin I/T: A specific cardiac marker used to diagnose myocardial infarction.
CK (creatine kinase): A muscle enzyme used to evaluate muscle damage.

Measurement Method

GOT is measured from venous blood serum or plasma. The measurement is performed photometrically using the IFCC-standardized method (International Federation of Clinical Chemistry). The precision and reproducibility of the measurement are high, and results can be reliably compared between laboratories when measured at 37 degrees Celsius according to the IFCC method.

When to Seek Medical Advice

Elevated GOT levels should always be assessed and further investigated by a physician, particularly when:

Values are significantly or persistently elevated
Accompanying symptoms such as fatigue, jaundice, upper abdominal pain, or shortness of breath are present
Known risk factors exist, such as regular alcohol consumption, use of hepatotoxic medications, or pre-existing liver disease

A single mildly elevated GOT level may occur without clinical significance, for example after intense physical exercise or a muscle strain, and may not require further treatment in that context.

References

Thomas L. (Ed.): Clinical Laboratory Diagnostics. 9th Edition. TH-Books, Frankfurt 2020.
European Association for the Study of the Liver (EASL): EASL Clinical Practice Guidelines on non-invasive tests for evaluation of liver disease severity and prognosis. Journal of Hepatology, 2021.
Dufour D.R. et al.: Diagnosis and Monitoring of Hepatic Injury. Clinical Chemistry, 2000; 46(12): 2027-2049.

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