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However, a group of patients who had been treated with phenytoin and barbiturates were found to have elevated serum GGT activities without any other evidence of liver disease. The apparent effect of certain drugs on serum GGT activity indicates the need for caution in interpreting the results of this test.<\/jats:p>","DOI":"10.1136\/gut.13.9.702","type":"journal-article","created":{"date-parts":[[2007,9,18]],"date-time":"2007-09-18T17:41:31Z","timestamp":1190137291000},"page":"702-708","source":"Crossref","is-referenced-by-count":99,"title":["Serum \u03b3-glutamyl transpeptidase activity in liver disease"],"prefix":"10.1136","volume":"13","author":[{"given":"J. B.","family":"Whitfield","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"R. 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