I have a couple HCG questions if you all dont mind lending a hand.

I have 10,000iu of unmixed sterile hcg pregnyl in a sealed glass ampoule. it also came with another sealed glass ampoule of what I think is sodium chloride (dont have the bottle on hand right now).

question 1. when I mix my hcg do I mix all of the sodium chloride, or whatever it is in with it?

question 2. When I mix my hcg with the bac water I wanted to make sure my calculations were right. 10,000 iu of hcg with 4ml of bac water, when I draw hcg out into insulin needle at the 10 mark that should be 250 iu.. right?

question 3. i have always been led to believe that hcg is for sub q injections but on my box that i recieved it says for IM injections only... does it really matter?