What is the fine-grained topic of the following text: Plasma markers can sometimes fix up with provision subtle insights into the wildness of the hepatic insult: elevations in alkaline phosphatase and -glutamyltranspeptidase (GGT), after example, can indicate impaired biliary excretion rather than hepatocel- lular necrosis. Only return the topic.
Use of Plasma Markers in Hepatic Diagnosis