Parenteral Medication Administration - NCLEX-PN

Intramuscular. Muscles have rich vascularity, enabling rapid absorption and quicker systemic effects compared to the slower intradermal and subcutaneous routes.

20–25 gauge. Larger gauge needles are required to penetrate muscle tissue effectively and deliver viscous medications without excessive resistance.

Ventrogluteal. This site avoids major nerves and vessels, providing a safer alternative to the dorsogluteal area which risks sciatic nerve damage.

25–27 gauge. Smaller gauge needles allow precise delivery of tiny volumes into the dermal layer without penetrating deeper tissues during tests like TB screening.

$5^\circ$–$15^\circ$. A shallow angle ensures the medication is deposited just beneath the epidermis, forming a wheal without entering subcutaneous tissue.

Vastus lateralis. Infants have better-developed thigh muscles, making this site safer and more accessible than the smaller deltoid for injections.

Inner forearm (ventral forearm). This area has thin skin and fewer hair follicles, allowing clear visualization of reactions for tests like purified protein derivative (PPD).

A small wheal (bleb) forms. The wheal indicates successful deposition of fluid into the dermal layer, confirming proper technique for tests requiring local skin response.

Do not massage the site. Avoiding massage prevents bruising and hematoma formation, as heparin is an anticoagulant that increases bleeding risk at the site.

Do not aspirate. Aspiration is unnecessary for subcutaneous routes, as the risk of intravascular injection is low and the procedure adds no benefit.

Withdraw, discard, and prepare a new dose in a new site. Blood aspiration indicates possible vascular entry, requiring a new dose to avoid unintended intravenous administration and ensure intramuscular delivery.

Verify patient ID with two identifiers. Using two identifiers ensures patient safety by confirming the right person receives the medication, adhering to the six rights of administration.

Do not recap; activate safety device immediately. Immediate safety activation complies with OSHA standards to minimize exposure to bloodborne pathogens from accidental needlesticks.

Draw up regular insulin first. Drawing clear insulin first prevents contamination of the vial with intermediate-acting insulin, maintaining purity and efficacy.

Tuberculin syringe (1 mL). Its fine calibration in tenths of a milliliter enables accurate measurement of small doses needed for intradermal testing.

Up to 1 mL. The deltoid muscle's smaller size limits volume to prevent discomfort, tissue damage, or inadequate absorption from overload.

Do not aspirate. Intradermal injections target the dermis, where aspiration is not required due to minimal vascularity and small volumes used.

Insert quickly; inject medication slowly. Rapid insertion minimizes pain from needle movement, while slow injection allows gradual tissue accommodation and reduces pressure discomfort.

Up to 3 mL. The vastus lateralis's larger muscle mass accommodates greater volumes, promoting better dispersion and absorption without complications.

Insulin syringe (units). This calibration matches insulin dosing units precisely, ensuring accurate measurement and reducing medication errors in diabetes management.

$45^\circ$ or $90^\circ$. These angles allow proper deposition into the subcutaneous fat layer, with choice depending on patient body habitus and needle length.

$90^\circ$. Perpendicular insertion ensures the needle reaches deep into the muscle belly for optimal absorption and to avoid subcutaneous deposition.

Up to 3 mL. The ventrogluteal site's robust musculature safely handles larger volumes, reducing risks associated with excessive medication in smaller sites.

25–30 gauge. Finer needles minimize tissue trauma and discomfort when injecting into the less vascular subcutaneous layer for medications like insulin or heparin.