GH1 and acromegaly: Acromegaly was diagnosed based on high IGF-1 and a positive GH suppression test.18 GH suppression test is recommended to confirm the diagnosis by finding a lack of suppression of GH below 1 μg/L after documented hyperglycemia during an oral 75 g glucose load.18 During the test, both glucose and GH are measured at baseline, then every 30 minutes for 2 hours after ingestion of 75 g glucose solution.18