Certified Medical Assistant (CMA AAMA)PharmacologyMedium
A medical assistant is preparing to administer an influenza vaccine subcutaneously to an adult patient. Which of the following angles of insertion is appropriate?
- A15-degree angle
- B30-degree angle
- C45-degree angle
- D90-degree angle
Show answer & explanationAnswer & explanation
Correct answer: C. 45-degree angle
Subcutaneous injections are typically administered at a 45-degree angle. This angle ensures the medication is deposited into the subcutaneous tissue layer without reaching the muscle, especially in patients with average body fat.
Why the other options are wrong
- A. 15-degree angle is used for intradermal injections.
- B. 30-degree angle is not a standard angle for any common injection route.
- D. 90-degree angle is used for intramuscular injections, or for subcutaneous injections in obese patients with a longer needle.
Subcutaneous Injection Angle
The angle of insertion for a subcutaneous injection is typically 45 degrees to ensure the medication is delivered into the fatty tissue layer beneath the skin.
- Angle may be 90 degrees for obese patients or with shorter needles.
- Common sites: abdomen, outer upper arm, anterior thigh.
- Pinch skin to create a fat fold for insertion.
Memory trick: I.D. 15, S.Q. 45, I.M. 90