Parenteral Medication Administration - NCLEX Pn

1. What is the correct insertion angle for an intramuscular injection?

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

2. Which site is used for intradermal injections such as PPD testing?

   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).

3. What is the correct action if you aspirate blood when giving an IM injection (per facility policy)?

   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.

4. Which IM site is generally preferred for infants due to muscle development: deltoid or vastus lateralis?

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

5. Which syringe is typically used to measure small volumes for intradermal injections precisely?

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

6. What is the correct insertion angle for an intradermal injection?

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

7. What is the expected skin response that confirms a correct intradermal injection?

   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.

8. What is the correct needle handling rule after giving any injection to prevent needlestick injury?

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

9. What is the maximum volume typically recommended for a single adult deltoid IM injection?

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

10. What is the typical needle gauge range used for intramuscular injections in adults?

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

11. What is the correct insertion angle for a subcutaneous injection?

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

12. Which injection route has the fastest onset: intradermal, subcutaneous, or intramuscular?

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

13. What is the primary purpose of the Z-track IM injection technique?

    Prevent medication leakage into subcutaneous tissue. This technique displaces skin laterally before injection, creating a sealed path that traps medication in muscle and minimizes irritation to surrounding tissues.

14. Which action is correct for heparin subcutaneous injection: massage the site or do not massage?

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

15. What is the correct technique to reduce discomfort during IM injection regarding needle entry and medication push?

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

16. What needle gauge is typically used for subcutaneous injections (for example, insulin or heparin)?

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

17. Which action is correct for insulin subcutaneous injection regarding aspiration: aspirate or do not aspirate?

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

18. What is the maximum volume typically recommended for a single adult ventrogluteal IM injection?

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

19. Which syringe type is calibrated in units and commonly used for insulin administration?

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

20. Which IM site is preferred for adults to reduce risk of sciatic nerve injury: dorsogluteal or ventrogluteal?

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

21. Which step is required immediately before giving a parenteral medication to a patient at the bedside?

    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.

22. Identify the correct order when preparing two insulins: draw up regular insulin or NPH first?

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

23. What needle gauge is commonly used for intradermal injections (for example, TB testing)?

    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.

24. Which action is correct for intradermal injection regarding aspiration: aspirate or do not aspirate?

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

25. What is the maximum volume typically recommended for a single adult vastus lateralis IM injection?

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

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