I dont think this is either a .5ml or 1ml..I'll describe it as best as I can..it says 3/10cc at the bottom (I'm pretty sure 1cc=1ml) and it has 30 units down the length of it..so I assumed that 10 units would be 1/10 of a 1cc which is 1/10 of a mL right, so that would be work out to be 200mcg of solution based on what I dissolved. Here's the syringe, I tried to find it online
http://www.allegromedical.com/syringes-c570/insulin-syringe-3-10cc-30g-x-5-16-p549029.html so you can see what I am talking about. But if 10 units on the syringe is equal to 1/10 of 1cc(or mL), and 20mg of substance is dissolved in 10ml, than 10 units of that solution should equal 200mcg in solution right?...you really have me concerned that my measurements are off now and I wanna be sure that these 10 units = 200mcg...thanks for the help