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Transaminase Level – Meaning, Causes and Diagnosis

The transaminase level is a blood test value measuring liver enzyme concentrations, helping to detect liver damage or other medical conditions.

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Things worth knowing about "Transaminase Level"

The transaminase level is a blood test value measuring liver enzyme concentrations, helping to detect liver damage or other medical conditions.

What Is the Transaminase Level?

The transaminase level refers to the concentration of enzymes called transaminases measured in the blood. These enzymes are found primarily in the liver, but also in the heart, skeletal muscles, and kidneys. The two most clinically relevant transaminases are alanine aminotransferase (ALT, also known as GPT) and aspartate aminotransferase (AST, also known as GOT). When cells are damaged, these enzymes are released into the bloodstream, causing transaminase levels to rise.

Clinical Significance

Elevated transaminase levels are a key indicator of tissue damage, particularly in the liver. They are among the most commonly observed abnormalities in routine laboratory diagnostics and can point to a wide range of conditions. Normal reference ranges are approximately:

ALT (GPT): up to about 35 U/l in women, up to about 45 U/l in men
AST (GOT): up to about 35 U/l in women, up to about 45 U/l in men

These reference values may vary slightly between laboratories.

Causes of Elevated Transaminase Levels

An elevated transaminase level can have many causes:

Liver Diseases

Viral hepatitis (Hepatitis A, B, C, D, E)
Alcoholic liver disease
Non-alcoholic fatty liver disease (NAFLD) and non-alcoholic steatohepatitis (NASH)
Autoimmune hepatitis
Liver cirrhosis
Liver tumors or metastases

Other Causes

Heart attack or myocarditis (elevated AST)
Muscle disorders or intense physical exertion
Medications and dietary supplements (e.g., paracetamol, statins, certain antibiotics)
Thyroid disorders
Celiac disease
Inherited metabolic disorders

Diagnosis and Interpretation

Transaminase levels are determined through a simple blood test. When interpreting results, it is important to consider both ALT and AST together. The De Ritis ratio (AST/ALT quotient) provides additional clues about the underlying condition: a ratio above 2 suggests alcoholic liver disease, while a ratio below 1 is more commonly associated with viral hepatitis or fatty liver disease.

A single elevated transaminase result is not always cause for alarm. It is important to monitor values over time and consider them alongside other laboratory markers such as gamma-GT, alkaline phosphatase, and bilirubin, as well as clinical findings.

When to See a Doctor

If elevated transaminase levels are detected during a routine check-up, medical evaluation is recommended. The following symptoms in combination with elevated levels require prompt medical assessment:

Yellowing of the skin or eyes (jaundice)
Severe fatigue or weakness
Upper abdominal pain, especially on the right side
Dark urine or pale stools
Nausea and vomiting

Treatment

Treatment depends on the underlying cause. In cases of alcohol-related liver damage, abstinence from alcohol is essential. If elevated levels are medication-induced, the causative agent is discontinued or replaced. Viral hepatitis can be treated with specific antiviral medications. Fatty liver disease is primarily managed through lifestyle modifications such as weight loss and increased physical activity.

References

Longo, D. L. et al. (eds.) - Harrison's Principles of Internal Medicine, 21st edition, McGraw-Hill, 2022
European Association for the Study of the Liver (EASL) - EASL Clinical Practice Guidelines: Management of Hepatitis B Virus Infection. Journal of Hepatology, 2017. Available at: https://www.journal-of-hepatology.eu
Kwo, P. Y., Cohen, S. M., Lim, J. K. - ACG Clinical Guideline: Evaluation of Abnormal Liver Chemistries. American Journal of Gastroenterology, 2017. Available at: https://www.ncbi.nlm.nih.gov/pubmed/27995906

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