Hcg 10000iu with 1ml sodium chloride equals what?

So if I mix the 1ml that came with it and then pull up .5ml is that 250 or 500? The reason I'm asking is because it looks like it only left enough in the bottle for 1 more of same dose... i feel like there should be more... this is all brand new to me so thanks in advance for your patience and any guidance.