What angle(s) are acceptable for a subcutaneous injection?

• A. 45 degree or 90 degree angle
• B. 15 degree angle
• C. 30 degree angle
• D. 60 degree angle

Answer: (A)

Subcutaneous injections are placed into the fatty tissue just under the skin, so the angle is chosen to keep the needle in that tissue and not in muscle or the dermis. The acceptable angles are about 45 degrees or 90 degrees, depending on tissue depth and the needle length. A 45-degree angle works well when you can lift a skin fold and there isn’t a lot depth to the subcutaneous layer. A 90-degree angle can be used when there is more subcutaneous tissue or when using a shorter needle and you want to ensure the injection stays in the subcutaneous layer. Angles like 15, 30, or 60 degrees aren’t standard for subcutaneous injections because they’re more likely to place the medication into the dermis or fail to reach the subcutaneous tissue reliably.