Analyzing the results of an Oral Glucose Tolerance test

Patient : When analyzing the results of an oral glucose tolerance test (to exclude acromegaly) , if the baseline growth hormone is 0.2 ng/ml, and it suppresses to less than 0.1 ng/ml, is that reliable? Or should the baseline GH be higher to ensure accuracy? Because Quest says that if at any point GH is suppressed to less than 0.4 ng/ml acromegaly is excluded, which suggests baseline GH would have to be higher than 0.4 ng/mL to use that criteria.
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