A newborn is administered an injection of Vitamin K shortly after birth. What is the primary clinical reason for this intervention?

Appeared in: AIIMS Delhi NO- 2019

Explanation

Newborns have low levels of Vitamin K because it does not cross the placenta well, their gut is sterile and cannot produce it, and breast milk contains low amounts.
Vitamin K is essential for the liver to synthesize clotting factors II, VII, IX, and X.
Without these clotting factors, newborns are at high risk for spontaneous and potentially life-threatening bleeding, a condition known as Vitamin K Deficiency Bleeding (VKDB) or hemorrhagic disease of the newborn.
A prophylactic injection of Vitamin K effectively prevents this dangerous condition.

Option A: While Vitamin K is involved in bone metabolism, this is not the immediate, life-saving reason for its administration at birth. The critical priority is preventing hemorrhage.
Option C: Retinal development is primarily dependent on Vitamin A, not Vitamin K. There is no physiological link between Vitamin K and retinal health.
Option D: Vitamin K's primary role is in the coagulation cascade. It does not have a direct function in boosting or modulating the immune system.

Clinical Relevance

Nursing practice connection: Safe nursing care depends on performing The concept tested is the rationale behind prophylactic Vitamin K administration to newborns in the correct sequence, documenting the action clearly, and monitoring for the expected response.
Administering Vitamin K is a fundamental, non-negotiable standard of care in neonatal practice. It is a critical patient safety measure to prevent potentially fatal intracranial hemorrhage.
Nurses are responsible for correctly administering the injection, documenting it, and educating parents about its importance, especially if they express hesitation.
What if a parent refuses the Vitamin K injection? The nurse's priority is to provide clear, evidence-based education on the severe risks of VKDB, including brain damage and death. The refusal must be documented meticulously, and the physician must be informed immediately. The infant will require close monitoring for any signs of bleeding.

How to Approach the Question

First, identify the core subject of the question: the purpose of Vitamin K injection in a newborn.
Recall the physiological state of a newborn. Key points include a sterile gut and immature organ systems.
Connect Vitamin K to its primary physiological function, which is its role in the blood clotting cascade.
Evaluate each option based on this primary function. Option A (bone) is a secondary role. Option C (retina) is incorrect (that's Vitamin A). Option D (immune system) is incorrect.
Conclude that the most critical and primary reason is to prevent bleeding due to the newborn's inability to produce clotting factors, which directly corresponds to preventing hemorrhagic disease.

Concept Tested & Keywords

Concept Tested: The concept tested is the rationale behind prophylactic Vitamin K administration to newborns.
Stem keywords: newborn, injection, Vitamin K, shortly after birth
Lead-in keywords: primary clinical reason

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E6 Nelson Textbook of Pediatrics(2024) — Volume 1 p. 1138-1140

E6 Parks TextBook of Preventive & Social Medicine part 1 — Subpart C (pp 404-604 of 604) p. 156-158

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