Igf is checked after aprox 3-4 weeks of continuous use. I check mine aprox 1 hr or so after morning inj of 2-2.5 iu (depending on daily split at the time) fasted.
Igf is not to be confused as a serum test. As it will take tome for your liver to produce igf.
As you will look at my blood work I have produced higher numbers injecting lower amounts all because of split dosing.
For instance I pin 5iu of hgh I was scoring mid to high 5’s. But when I’m split dosing and pinning 2.5iu I pull mid to high 6’s blood pulled within the same time fram after injection