Proper technique for administering an injection in the arm

Generally, an arm injection refers to a subcutaneous injection administered in the arm. Common injection sites include the gluteus maximus, gluteus medius, gluteus minimus, and deltoid muscle of the arm. Taking the deltoid muscle as an example, the specific procedure is as follows:

1. The patient should sit down and roll up their sleeve to the shoulder, exposing the deltoid muscle.

2. Perform routine disinfection of the deltoid area and allow it to dry.

3. Expel air from the syringe. With one hand, stretch the skin at the injection site taut; with the other hand, hold the syringe and insert the needle quickly at a 30- to 40-degree upward angle. Insert the needle 2–3 cm into the skin and stabilize it.

4. After confirming no blood return by aspiration, slowly inject the medication.

5. Use a cotton swab to apply pressure to the injection site and quickly remove the needle.

6. Continue applying pressure until there is no bleeding, then discard the cotton swab—the injection is complete.

To avoid strong local irritation to the skin at the injection site, be sure to rotate injection locations and avoid repeated injections in the same spot. If redness, swelling, or hard nodules occur after injection, apply a warm, moist towel compress to help relieve symptoms. It is recommended to visit a qualified medical facility and have the procedure performed under the guidance of a healthcare professional.