NB,
Depends upon how you have diluted it. 'Slin is 100IU / ml. So, a standard slin pin would hold 30IU or 50IU (0.3ml or 0.5ml). You'll want to figure out from your kit or whatever you have how much GH IU's you have and dilute accordingly.
Say you have 128 IU of GH. Diluted in 1ml, this gives 128IU / ml. Thus, the GH would be more concentrated than the 'slin (which is 100IU / ml), i.e., the volume of slin that give 1IU would, in this case, give you 1.28 IU of GH.
Hope this helps.
-R