Remove the syringe and needle from the insulin bottle. Press the plunger with your thumb to push the air out of the syringe, until the correct amount of insulin remains in the syringe. Double check that the dose of insulin is correct. This 30 unit syringe has been filled to 14.5 units. There is 1 unit between each back line on this smaller syringe.
Smaller syringes allow for more accurate measurements of small amounts of insulin.
The top of the black rubber stopper is half way between 14 and 15 units. This 100 unit syringe has been filled to 48 units. There are 2 units between each black line on the barrel. The volume is measured at the TOP of the black rubber stopper on the plunger. The skin does not need to be disinfected before inserting the needle.