OGTT test (Oral Glucose Tolerance Test)

Hi, I am having an OGTT test tomorrow and I have forgotten the instruction to fast and the clinic is not open until tomorrow. So I would like to check what time do we start fasting and no drinking of water is allowed until tomorrow’s test is done right? Thanks

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No drinks & food after 12midnight. Only small sips of water allowed.

After 12am cannot eat anything and only tiny sips of plain water is ok