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Liver Inflammation Markers – Meaning and Normal Values

Liver inflammation markers are blood values that indicate inflammation or damage to the liver. They help doctors detect and monitor liver diseases at an early stage.

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Things worth knowing about "Liver Inflammation Markers"

Liver inflammation markers are blood values that indicate inflammation or damage to the liver. They help doctors detect and monitor liver diseases at an early stage.

What Are Liver Inflammation Markers?

Liver inflammation markers are laboratory parameters measured in the blood that provide information about inflammation, damage, or functional impairment of the liver. They play a central role in diagnosing liver conditions such as hepatitis, liver cirrhosis, or toxic liver damage. Elevated levels of these markers in the blood typically indicate that liver cells have been damaged or destroyed, releasing their contents into the bloodstream.

The Most Important Liver Inflammation Markers

Transaminases (ALT and AST)

The most well-known liver inflammation markers are the transaminases:

ALT (Alanine Aminotransferase): Also known as GPT, ALT is highly liver-specific. Elevated levels almost always point to liver damage.
AST (Aspartate Aminotransferase): Also known as GOT, AST is also found in heart and muscle cells. Markedly elevated AST levels may indicate severe liver damage or a heart attack.

Gamma-Glutamyl Transferase (GGT)

GGT is a sensitive marker for liver disease, particularly in cases of chronic alcohol consumption or bile duct disorders. Elevated GGT levels may also indicate a fatty liver or the use of certain medications.

Alkaline Phosphatase (ALP)

Alkaline phosphatase is also found in the bile ducts. Elevated values often indicate bile duct disease, liver metastases, or bone disorders.

Bilirubin

Bilirubin is a breakdown product of the red blood pigment hemoglobin. Elevated bilirubin levels cause visible jaundice (icterus) and indicate that the liver is unable to adequately process or excrete bilirubin.

Lactate Dehydrogenase (LDH)

LDH is a non-specific marker that rises in many types of tissue damage, including severe liver disease.

Causes of Elevated Liver Inflammation Markers

Elevated liver inflammation markers can have many causes, including:

Viral hepatitis (Hepatitis A, B, C, D, E)
Alcoholic liver disease
Non-alcoholic fatty liver disease (NAFLD)
Drug- or toxin-induced liver damage
Autoimmune hepatitis
Bile duct diseases (e.g., cholelithiasis, cholestasis)
Liver metastases or primary liver tumors
Heart failure (congestive hepatopathy)

Diagnosis and Interpretation

Liver inflammation markers are measured through a simple blood test. The values must always be interpreted in their clinical context, as mildly elevated results can also be caused by physical exertion, muscle injury, or other harmless factors. In addition to laboratory values, the physician considers symptoms, medical history, and further investigations such as ultrasound or liver biopsy.

Reference Values (Approximate)

ALT: up to approx. 35 U/l (women), up to approx. 50 U/l (men)
AST: up to approx. 35 U/l
GGT: up to approx. 40 U/l (women), up to approx. 60 U/l (men)
ALP: 40–130 U/l
Total bilirubin: up to approx. 1.2 mg/dl

Treatment and Follow-Up

Treatment depends on the underlying cause. Viral hepatitis is treated with antiviral medications, alcohol-related liver disease requires complete abstinence from alcohol, and drug-induced liver injury involves discontinuing the causative agent. Liver inflammation markers are monitored regularly to assess the response to treatment and to detect any deterioration early.

References

European Association for the Study of the Liver (EASL): Clinical Practice Guidelines on the management of hepatitis B virus infection. Journal of Hepatology, 2017.
Schiff, E.R., Maddrey, W.C., Reddy, K.R.: Schiff's Diseases of the Liver. Wiley-Blackwell, 12th edition, 2018.
Kwo, P.Y., Cohen, S.M., Lim, J.K.: ACG Clinical Guideline: Evaluation of Abnormal Liver Chemistries. American Journal of Gastroenterology, 2017.

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