What degree is used for an intramuscular injection?

• A. 90 Degrees
• B. 45 Degrees
• C. 15 Degrees
• D. 1 Inch Border

Answer: (A)

Injections into muscle must reach the muscular tissue, so the needle is inserted perpendicular to the skin. That perpendicular, or about a 90-degree angle, ensures the medicine goes through the skin and subcutaneous tissue into the muscle for proper absorption. A shallower angle like 45 degrees would more likely deposit the liquid in fat rather than muscle, and 15 degrees is suitable for certain skin- or fat-layer injections rather than muscle. The option about a border length isn’t an injection angle at all. So the correct approach is a 90-degree insertion to hit the muscle.