Certified Medical Assistant Test 2025 – 400 Free Practice Questions to Pass the Exam

The flu vaccine is commonly administered via intramuscular injection because this route allows for a quicker and more robust immune response. Intramuscular injections are typically given in larger muscle groups, such as the deltoid, gluteal, or vastus lateralis. The flu vaccine, which is an inactivated virus, benefits from this method as it provides better absorption and distribution within the body compared to subcutaneous injections.

Other types of injections mentioned have specific delivery methods that are best suited for their pharmacokinetics. Insulin is usually administered subcutaneously to allow for slower absorption and to mimic the body’s natural insulin release. Heparin is also typically given subcutaneously to avoid complications associated with intramuscular injections, such as bleeding risks, especially in patients who may already have a predisposition to bleeding disorders. Subcutaneous B12 is administered in a similar manner to ensure a gradual release, making it more effective for patients who have malabsorption issues or deficiencies over time.