That is for the HGH serum test. IGF levels are pretty stable.I wonder how you would have tested 3 hours after you injected the 9iu. 3 hours is a standard protocol a lot of guys use. I’m nt sure exactly were it came from or if maybe that’s when it peaks in your blood. Good info to know that your levels are still that high 18 hours later. Probably a good reason I have less side effects using gh EOD when using high doses. Good info