Abnormal liver enzyme
Abnormal liver enzyme detection and estimation provides a comprehensive foundation for the identification of inflammatory diseases associated with the liver. These values are raised when liver cells are damaged. Routine liver function test helps in the estimation and detection of abnormal liver enzymes.
In many cases liver enzyme abnormalities are caused because of hepatocellular injury. This condition results when the liver cells are damaged producing leaky membranes. The intracellular enzymes enter the blood stream as a result of these leaky membranes. The predominant intracellular liver enzymes which are analyzed indicating the hepatocellular damage are aspartate aminotransferase (AST) and alanine aminotransferase (ALT). Hepatitis is one of major causes for the hepatocellular damage.
Cholestasis is another condition, resulting in the production of abnormal liver enzymes. It is caused because of biliary obstruction or hepatic infiltration. The resulting enzymes produced because of these conditions include alkaline phosphatase (ALT) and gamma glutamyl transpeptidase (GGT).
Risk factors due to abnormal liver enzymes
The risk factors pertaining to the onset of liver disease are based upon factors such as behavior, medications and systemic illness. The patients categorized based on the behavior include IV drug users, history of multiple sex partners, alcohol abuse and tattoos. The patients categorized based on the medication include acetaminophen and anticonvulsant drug users. Systemic conditions such as diabetes, auto immune diseases, obesity and metastatic cancers are major risk factor indicatives of hepatocellular damage which elevate the abnormal liver enzyme values.
Liver function test
Alanine aminotransferase (ALT): It is also known as serum glutamic pyruvic transaminase (SGPT) analysis. It helps in the detection of hepatocellular damage due underlying conditions such as hepatitis. The reference range for the ALT test is 9 -72 u/l.
Alkaline phosphatase (ALP): This test used in the detection of biliary obstruction in liver and also bone disorders. The results are correlated with other liver function tests to diagnose liver cell damage. The reference range is 38-126 u/l
Aspartate aminotransferase (AST): AST is also used in the detection of liver cell damage and membrane leakage of the liver cells. The reference range is 8- 50 u/l.
Bilirubin: Bilirubin diagnostic test is administered to detect conditions such as cirrhosis, hepatitis and presence of gall stones. It is predominantly ordered in the case of newborns to detect the incidence of jaundice. The reference range for total bilirubin is 0.2-1.3 mg/dl.
Albumin: Albumin test signifies the presence of liver disorder or nephrotic syndrome. Low albumin levels indicate the presence of liver damage. The reference range is 3.9- 5.0 g/dl.
Lactate dehydrogenase (LDH): LDH values indicate the presence of tissue damage. It is used to detect tissue damage associated liver, kidney and cardiac origins. The reference range for LDH is 313-618 u/l.
Comprehensive metabolic panel (CMP): Comprehensive metabolic panel pertaining to liver disease is very significant in the detection of underlying liver disorders such as hepatitis especially in newborns. It also helps in the identification of liver damage caused because of alcohol consumption.
Gamma glutamyl transferase (GGT): This test acts as a precursor for the estimation of alkaline phosphatase values pertaining to hepatocellular damage and biliary obstruction. GGT and ALP tests are interrelated in case of hepatic and bone disorders.
Total protein: Total protein levels are measured by evaluating the albumin and globulin ratios. The reference range for total protein is 6.3- 8.2 g/dl. The decrease in total protein value indicates the onset of liver or kidney disease.
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Bibliography / Reference
Collection of Pages - Last revised Date: February 7, 2023