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[Dependency on age of laboratory values in dogs and cats. 1. Enzyme activities in blood serum].

A significant dependency on the age of dogs can be observed in the following serum enzymes: AST, GLDH (low degree), SAP, GGT, and CK. In cats a dependancy on age can be seen in ALT, AST, SAP, LDH, alpha-HBDH, alpha-Amylase, Lipase, and CK. The differences between old and young animals are small in AST, GLDH, GGT, and LDH. Therefore, the differences are not important for routine diagnosis. Comparing ALT activities, lower values were found in kittens. Similar results were found in CK activities. On the other hand higher values of SAP can be seen in young than in adult individuals. In geriatric animals, diagnostically important changes of the enzyme activities examined in this study could not be found.