What are the five items in a liver function test?
Dec 29, 2022
Source: Cainiu Health
Dr. Jin Zhongkui
Introduction
Liver function tests include five items: alanine aminotransferase, aspartate aminotransferase, direct bilirubin, indirect bilirubin, and total bilirubin. Alanine aminotransferase is primarily present in the cytoplasm of hepatocytes; elevated levels indicate liver damage. Aspartate aminotransferase is mainly located in the mitochondria of hepatocytes, as well as in the mitochondria of muscle cells.
The liver's primary function is detoxification, so good liver health ensures that toxins within the body can be more smoothly eliminated. What are the five items included in a liver function test?
What Are the Five Items in a Liver Function Test?
The five liver function tests include alanine aminotransferase (ALT), aspartate aminotransferase (AST), direct bilirubin, indirect bilirubin, and total bilirubin. Alanine aminotransferase is mainly found in the cytoplasm of liver cells; elevated levels indicate liver damage. Aspartate aminotransferase is primarily located in the mitochondria of liver cells, as well as in the mitochondria of muscle cells. If both AST and ALT are elevated simultaneously, it suggests significant liver damage, which may result from inflammation, alcohol intoxication, or medication side effects.
Elevated direct bilirubin indicates liver disease or impaired bilirubin excretion. Indirect bilirubin is formed when red blood cells are broken down in the bloodstream but is neither synthesized nor converted in the liver. High levels suggest either liver disease or increased destruction of red blood cells.
Total bilirubin includes both direct and indirect bilirubin. When elevated, further testing is needed to determine which component is increased, helping identify the cause of jaundice. Normal values for these five indicators may vary slightly depending on the hospital or testing equipment used; therefore, reference ranges should be interpreted according to the specific institution's standards. We hope this answer has been helpful to you. Wishing you good health and happiness!
