Yes: A GGT test needs three days on a diet with about 150 gm cabohydrates each day, and an overnight fast (at least 8 hours) before the test.
Answered 1/12/2015
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Which test?: If you mean "glucose tolerance test", then breakfast beforehand will ruin it, as will not complying with the preparation. If you mean "gamma-glutamyl transpeptidase / transferase" or "drunk screen", breakfast matters less, but be advised that some normal non-drinking folks have a hereditary tendency to run a very high GGT and I have to write letters for a few such folks each year.
Answered 1/12/2015
5.7k views
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