Originally Posted by
Amuuzen
The big thing here is to remember your volumes. Insulin is measured in units that, like said above, is 0.1mL = 1 Unit. Many insulin syringes come in 30 units (0.3mL) and 50 units(0.5mL) depending on how much insulin the diabetic commonly takes. If you want to base this all on 100 units, be sure to ask for the 100 unit or 1 mL syringes and all the math will be easier. There are sizes to the syringes (both length and width/gauge) also and if you are buying from a pharmacy, know your volumes and needle sizes too. I like how Youthful55guy worded it, the math is easier like that (0.5 mL for 500 IU's).
Just my $0.02.