Hi Belinda, and welcome. If you mix your 5000iu vial, your dose would indeed measure differently on your syringe.
Most suppliers instruct you to mix 5000iu with 5ml, as you said. But we consider even the 1:1 ratio of mixing to be too potent. So we suggest you mix at least 1:2 (5000iu HCG to 10ml bacteriostatic water. That gives a strength of 500ius per ml water.) If you mix that way, here are the doses:
200 divided by 500 = .4 or 40
175 divided by 500 = .35 or 35
150 divided by 500 = .3 or 30
125 divided by 500 = .25 or 25
(to get a different dose, divide the dose you want by the strength, so a 180iu dose would pull to .36 or 36 on a U-100 insulin syringe)
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