護理師準備對成人病人進行肌肉注射（IM），下列哪個部位注射 2 mL 藥物最安全？
A nurse is preparing to administer an intramuscular (IM) injection to an adult client. Which of the following sites is the safest for the administration of a 2 mL medication?
- ARectus femoris site股直肌部位
- BDorsogluteal site背臀肌部位
- CDeltoid site三角肌部位
- DVentrogluteal site✓ 正解腹臀肌部位
腹臀肌（Ventrogluteal）部位遠離大型神經與血管，是成人肌肉注射最安全、最推薦的部位。背臀肌（Dorsogluteal）過去常被使用，但因靠近坐骨神經，風險較高；三角肌適合小體積藥物（<1 mL）；股直肌主要用於自我注射。
The ventrogluteal site is the safest and most recommended location for intramuscular injections in adults because it is away from major nerves and blood vessels. It can comfortably accommodate larger volumes, such as 2 mL, unlike the deltoid muscle which is limited to smaller amounts. Other sites like the dorsogluteal are avoided due to the risk of sciatic nerve injury, and the rectus femoris is not a standard site for routine injections.
台灣傳統教育仍常教導背臀肌注射，但現今臨床已逐漸轉向採納腹臀肌為標準，與美國趨勢同步。