An insulin syringe has four parts: a cap, a needle, a barrel, and a plunger.
Insulin syringes are made in several sizes.
|Syringe size||Number of units the syringe holds|
1/4 mL or 0.25 mL
1/3 mL or 0.33 mL
1/2 mL or 0.50 mL
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 read the numbers on the barrel. A 0.25 mL or 0.33 mL syringe often is best for people who have poor eyesight, because the numbers on the barrel are larger and easier to see.
Last Revised: November 3, 2011
Author: Healthwise Staff
Medical Review: Sarah Marshall, MD - Family Medicine & Rhonda O'Brien, MS, RD, CDE - Certified Diabetes Educator
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