<qa>  What test would be used to determine blood in the beginning and end of the OGTT?For this study, subjects will be asked to give the Investigators additional blood during either an OGTT a test for acromegaly or a growth hormone stimulation test GHRH-arginine stimulation. Ordinarily, blood would be measured at the beginning and end of the OGTT, and for the GHRH-arginine it would be measured one half hour before the test and then every half hour for 2 hours. 