A nurse is preparing to administer enoxaparin subcutaneously to a client using a prefilled syringe. The nurse should plan to use which of the following techniques when administering this medication?

Choice A rationale Expelling the air bubble from a prefilled enoxaparin syringe is not recommended. The manufacturer specifically includes a small air bubble which acts as an air lock. This air lock ensures that the entire dose is delivered and seals the medication in the tissue, preventing leakage back along the needle track and reducing bruising. Choice B rationale Gently massaging the injection site after enoxaparin administration is contraindicated. Massaging can disperse the medication too rapidly, potentially increasing localized bleeding, bruising, and hematoma formation at the injection site. This can also alter the absorption rate of the drug, potentially affecting its therapeutic anticoagulant effect. Choice C rationale Aspirating prior to injecting subcutaneous enoxaparin is not recommended. Subcutaneous injections are administered into the fatty tissue layer, which lacks major blood vessels. Aspiration is typically performed for intramuscular injections to avoid injecting directly into a vessel; for enoxaparin, aspiration increases tissue trauma and bruising risk without benefit. Choice D rationale Enoxaparin is optimally absorbed when injected into abdominal subcutaneous tissue, specifically into the fat pads lateral to the umbilicus. This area provides consistent absorption and is generally less sensitive, minimizing patient discomfort. Alternative sites include the anterolateral or posterolateral thigh, but the abdomen is preferred for its predictability.