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Transaminases 1
#harrison #liver #liverfunctiontests #medicine
The aminotransfer- ases (transaminases) are sensitive indicators of liver cell injury and are most helpful in recognizing acute hepatocellular diseases such as hepatitis. They include aspartate aminotransferase (AST) and alanine aminotransferase (ALT). AST is found in the liver, cardiac muscle, skeletal muscle, kidneys, brain, pancreas, lungs, leukocytes, and ery- throcytes in decreasing order of concentration. ALT is found primarily in the liver and is therefore a more specific indicator of liver injury. The aminotransferases are normally present in the serum in low concentra- tions. These enzymes are released into the blood in greater amounts when there is damage to the liver cell membrane resulting in increased permeability. Liver cell necrosis is not required for the release of the aminotransferases, and there is a poor correlation between the degree of liver cell damage and the level of the aminotransferases. Thus, the absolute elevation of the aminotransferases is of no prognostic signifi- cance in acute hepatocellular disorders. The normal range for aminotransferases varies widely among labo- ratories, but generally ranges from 10 to 40 IU/L.
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  • owner: nerdparty67 - (no access) - HARRISON Principles of Internal Medicine 20th Edition.pdf, p2339
  • owner: Anonymouse - (no access) - @MBS_MedicalBooksStore_2018_Harrison's.pdf, p2385


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