In physiological jaundice, serum bilirubin does not exceed

RUHS, Jaipur, M.Sc Nursing Entrance Exam-2022

Child Health Nursing (Pediatrics)

Easy

Appeared in: RUHS, Jaipur, M.Sc Nursing Entrance Exam-2022

Explanation

Physiological jaundice is a normal process in newborns, but it has defined limits to distinguish it from disease states.
While average peaks are lower (5-12 mg/dL), 15 mg/dL is the widely accepted upper threshold for physiological jaundice, especially when considering both term and preterm infants.
Levels rising above 15 mg/dL are a key indicator to investigate for pathological causes like hemolysis, infection, or metabolic disorders.
This threshold helps guide clinical decisions regarding monitoring, further testing, and the potential need for interventions like phototherapy.

Option A: A level of 5 mg/dL is a common and expected finding during the peak of physiological jaundice in a term infant. It is not the upper limit.
Option B: A level of 10 mg/dL is also within the normal range for physiological jaundice, especially in preterm or breastfed infants. It is not the maximum threshold.
Option D: A serum bilirubin level of 20 mg/dL is considered pathological and dangerous. It significantly exceeds the safe limits of physiological jaundice and poses a high risk for kernicterus (bilirubin-induced brain damage).

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Serum bilirubin levels in neonatal physiological jaundice as background academic context rather than a clinical decision trigger.
Nurses play a critical role in preventing kernicterus by meticulously monitoring all newborns for jaundice.
Nursing responsibilities include performing routine visual assessments, using a transcutaneous bilirubinometer (TcB) for screening, and obtaining serum samples (TSB) for confirmation when needed.
Patient education is key. Nurses must teach parents the signs of worsening jaundice and when to seek medical care after discharge.

How to Approach the Question

First, identify the key terms in the question: 'physiological jaundice' and 'serum bilirubin does not exceed'. This tells you the question is asking for the upper limit of a normal process.
Recall the definition of physiological jaundice: it's common, appears after 24 hours, and is self-limiting.
Differentiate this from pathological jaundice, which is more severe, appears earlier, and has higher bilirubin levels.
Think about the typical bilirubin curves for newborns. While the average peak is around 5-8 mg/dL, the 'safe' upper limit before it's considered abnormal is higher.
Evaluate the options. 5 and 10 mg/dL are too low; they are common values, not the limit. 20 mg/dL is a danger level associated with pathology.
Select the option that represents the established upper boundary for physiological jaundice, beyond which further investigation is warranted. This is 15 mg/dL.

Concept Tested & Keywords

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E6 Nelson Textbook of Pediatrics(2024) — Volume 1 pp. 1120-1122, 1116-1118

E6 Textbook of Biochemistry for medical StudentsDM Vasudevan Part 2 — Subpart A (pp 1-239 of 478) p. 28-30