What is an insulin pen?

An insulin pen is specifically designed as an injection device that holds a cartridge of insulin. This allows individuals with diabetes to administer their insulin doses in a more convenient and precise manner compared to traditional syringes or vials. The pen typically has a dial that enables users to select their needed dosage, and it delivers the insulin through a fine needle, which can help reduce discomfort associated with injections.

Other options describe devices or methods that are related to diabetes management but do not accurately represent what an insulin pen is. For instance, a glucose meter is used for monitoring blood sugar levels, while a method of oral insulin administration implies a form of delivery that is not currently standard for insulin, as insulin is primarily administered via injection. Therefore, the description of an insulin pen as an injection device that holds a vial of insulin is the most accurate representation of its function and purpose.