Serum enzyme tests in diseases of the liver and biliary tree

American Journal of Clinical Pathology
G EllisA M Ward

Abstract

Eight serum enzyme tests were performed over a three-year period in 1,147 cases of patients with suspected hepatobiliary disease, of whom 580 had identifiable primary disease of the liver or biliary system. Individually, aminotransferase assays did not provide good discrimination among the various categories of hepatobiliary disease, but when expressed as a ratio a useful degree of discrimination was obtained. Isocitrate dehydrogenase, guanase and glutamate dehydrogenase alone were poor discriminants of the various disease categories studied; combination of the latter enzyme with the aminotransferases in various ratios did not achieve worthwhile improvement. Adenosine deaminase was normal in most patients with extrahepatic obstruction and abnormal in most patients with parenchymal hepatic disease, and is potentially a useful test additional to the aminotransferases in routine diagnosis. 5'-Nucleotidase was more sensitive and specific than alkaline phosphatase in diagnosing hepatobiliary disorders. Abnormalities of all these enzymes were encountered in patients who did not have hepatobiliary disease, most frequently among subjects with cancer, diabetes mellitus, and diseases of the respiratory and cardiovascular systems.

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