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You will be asked not to eat or drink anything for four hours before the test. If you are diabetic, you will get some special instructions to follow.
If you take regular medication, take your tablets as normal (with a small amount of water, if you need it).
The hospital will give you (or send you by post) instructions with your appointment letter. If in doubt, please ask.
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Page last modified 20 March 2009
Page last reviewed 22 September 2008
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