Glucose Fail. False Positive?

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I failed the one hour glucose at 184 at 6:30am.

I was told I have gestational diabetes.

I then got a monitor, continue to eat as I normally do and every reading for 3 days (fasting, and 1hr after each meal) is within appropriate range.

Did I get a false positive because I was dehydrated when I went into the test?

I am 25 weeks. All my readings are under 100. My fasting are usually 75-82.