An insulin syringe has three parts: a needle, a barrel, and a plunger.
Insulin syringes are made in several sizes.
Use the smallest syringe size you can for the dose of insulin you need. The measuring lines on the barrel of small syringes are farther apart and easier to see. When you choose the size of syringe, consider the number of units you need to give and how well you can see the markings on the barrel.
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