68W Limited Primary Care Practice Exam 2025 – Complete Test Prep Resource

Question: 1 / 400

What is the recommended needle size for an injection into the deltoid muscle?

1 inch

The recommended needle size for an injection into the deltoid muscle is 1 inch. This length is typically sufficient to ensure that the medication is delivered into the muscle, which is important for proper absorption and effectiveness. The deltoid muscle is located just below the surface of the skin, making a 1-inch needle appropriate for most adult patients, particularly those with an average amount of subcutaneous tissue.

In clinical practice, using a needle that is too long could result in the needle going deeper than necessary, potentially reaching structures like nerves or blood vessels, while choosing a needle that is too short may not penetrate the muscle sufficiently, leading to inadequate medication delivery. Therefore, a 1-inch needle balances these considerations effectively for intramuscular injections in the deltoid region.

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1.5 inch

2 inch

0.5 inch

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