What is the preferred site for administering DPT vaccine in infants?

RML PRE 2025

Child Health Nursing (Pediatrics)

Easy

Appeared in: RML PRE 2025

Explanation

The vastus lateralis muscle is the recommended site for IM injections in infants as per guidelines from the CDC and the Indian Academy of Pediatrics.
This muscle is large and well-developed even in newborns, ensuring proper deposition and absorption of the vaccine.
Its location on the anterolateral thigh is distant from the sciatic nerve and major blood vessels, making it the safest option to prevent nerve damage or accidental intravenous injection.
The site can safely accommodate the standard vaccine volume (0.5 mL) for infants.

Option A: The dorsogluteal muscle is underdeveloped in infants and is located close to the sciatic nerve. Using this site poses a significant risk of nerve damage.
Option B: The gluteus maximus is the primary muscle of the dangerous dorsogluteal site. In infants, it is mostly fat, which would lead to subcutaneous rather than intramuscular injection, impairing vaccine efficacy and increasing local reactions.
Option D: The gluteus medius is part of the ventrogluteal site. While this site is safer than the dorsogluteal site, the vastus lateralis is more easily located and is the universally recommended primary site for infants.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain The concept tested is the correct and safe anatomical site for administering intramuscular (IM) immunizations, specifically the DPT vaccine, in infants as background academic context rather than a clinical decision trigger.
Correct site selection is a critical nursing responsibility to ensure patient safety and vaccine effectiveness. Using the wrong site can lead to serious complications like nerve damage, paralysis, abscess formation, or vaccine failure.
Nurses must be proficient in landmarking the vastus lateralis site: identifying the area one handbreadth below the greater trochanter and one handbreadth above the knee on the outer-middle part of the thigh.
What if? If a child has a localized skin infection or injury at the vastus lateralis site on one leg, the nurse should use the vastus lateralis muscle on the contralateral (opposite) leg.

How to Approach the Question

First, identify the key elements of the question: the medication type (DPT vaccine), the patient population (infants), and the route (implied IM injection).
Recall the principles of safe medication administration for pediatric patients, specifically the recommended IM injection sites for different age groups.
Evaluate each option based on safety and muscle development in an infant.
Eliminate the gluteal sites (Dorsogluteal, Gluteus Maximus) immediately due to the high risk of sciatic nerve injury in infants.
Compare the remaining options. Recognize that while the gluteus medius (ventrogluteal site) is used in older children, the vastus lateralis is the primary, universally recommended site for infants.
Select Vastus Lateralis as the safest and most appropriate site.

Concept Tested & Keywords

Concept Tested: The concept tested is the correct and safe anatomical site for administering intramuscular (IM) immunizations, specifically the DPT vaccine, in infants.
Stem keywords: DPT vaccine, infants, preferred site, administering
Lead-in keywords: What is
Clinical cues: The patient's age ('infants') is the most critical cue, as injection sites are age-dependent.

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