A 62-year-old patient is being discharged after a deep vein thrombosis and will continue enoxaparin 40 mg SC daily at home. The nurse is teaching self-injection. Which patient statement indicates correct understanding?

Enoxaparin (low-molecular-weight heparin) self-injection technique: prefilled syringe contains a small air bubble that should NOT be expelled — it ensures the full dose is delivered and seals the medication after injection. Site is the abdomen ("love handles"), at least 2 inches (5 cm) away from the umbilicus. Pinch a fold of skin and inject at a 90-degree angle. Do NOT rub or massage the site, as this increases bruising and hematoma. Choice 1 (upper arm + rubbing), choice 3 (expel air bubble), and choice 4 (massage) all violate established safe-injection technique.

In-depth explanation

Key teaching points for enoxaparin SC self-injection: (1) Site = abdomen, alternating left and right "love handle" areas, ≥2 inches from umbilicus. Avoid scarred or bruised skin. (2) Do not expel the prefilled air bubble — the bubble follows the medication and ensures complete dose delivery while preventing tracking. (3) Pinch a 1-inch skinfold and hold throughout the injection to prevent intramuscular delivery (which causes hematoma). (4) Inject at 90 degrees, push slowly, hold for 5–10 seconds before withdrawing. (5) Do not rub or massage — apply gentle pressure if bleeding. (6) Bruising is expected, but call provider for unusual bleeding, black stools, severe headache, or epistaxis.

Clinical scenario

<p>A <strong>62-year-old patient</strong> is being discharged after a <strong>deep vein thrombosis</strong> and will continue <strong>enoxaparin 40 mg SC daily</strong> at home. The nurse is teaching self-injection technique using a <strong>prefilled syringe</strong>.</p>

Key concepts

• Low-Molecular-Weight Heparin (LMWH) — A subgroup of heparin (e.g., enoxaparin, dalteparin) given subcutaneously for VTE prophylaxis or treatment. Predictable pharmacokinetics allow weight-based dosing without routine aPTT monitoring. Anti-Xa level is checked only in renal impairment, pregnancy, or extremes of body weight.
• Prefilled Air Bubble — A small air pocket included in enoxaparin prefilled syringes. Patients are taught NOT to expel the bubble — it ensures the full dose is delivered and seals the depot to prevent leakage along the needle track.
• SC Injection Technique — Pinch 1-inch skinfold to elevate subcutaneous tissue away from muscle, inject at 90° (45° if very thin), hold pressure briefly without rubbing. Rubbing increases bruising and hematoma; massage is contraindicated.