Most common cause of jaundice in a newborn within the first 24 hours of life?

Appeared in: HPSSC - 2015

Explanation

Jaundice appearing within the first 24 hours of life is always considered pathological and requires immediate investigation.
Erythroblastosis fetalis, a type of hemolytic disease of the newborn (HDN), is the most common cause in this period.
It results from maternal antibodies crossing the placenta and destroying fetal red blood cells (hemolysis), leading to a rapid increase in bilirubin levels. This is most often due to Rh or ABO blood group incompatibility.

Option B: While infection can cause or worsen jaundice, it is not the most common initial cause within the first 24 hours compared to hemolytic diseases.
Option C: Biliary atresia is a cause of prolonged, cholestatic (conjugated) jaundice, which presents much later.
Option D: By definition, physiological jaundice appears after 24 hours of life.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Pathological Jaundice in Newborns as background academic context rather than a clinical decision trigger.
Nurses are often the first to detect neonatal jaundice. The '24-hour rule' is a critical nursing assessment principle; any jaundice noted in the first day of life must be reported to the physician immediately.
Prompt identification allows for timely investigation (blood group, Coombs test, bilirubin levels) and treatment (phototherapy, exchange transfusion) to prevent kernicterus, a form of permanent brain damage.
What if? If the jaundice was first noted at 48 hours of life in an otherwise healthy, breastfeeding infant, the most likely cause would shift from pathological to physiological jaundice or breastfeeding jaundice.

How to Approach the Question

First, identify the most critical piece of information in the question stem: the time of onset, which is 'within the first 24 hours of life'.
Recall the fundamental rule of neonatal jaundice: appearance within 24 hours is always pathological.
Based on this rule, immediately eliminate 'Physiological' jaundice from the options, as its onset is defined as being after 24 hours.
Evaluate the remaining pathological causes. Recall that rapid, severe hemolysis is the most frequent reason for very early jaundice.
Recognize that 'Erythroblastosis fetalis' is the classic example of a hemolytic disease causing early jaundice.
Differentiate this from other pathological causes like 'Biliary atresia', which has a much later onset (weeks), and 'Septicaemia', which is a less common cause in this specific timeframe.

Concept Tested & Keywords

Qh6_wjhKWzU6X8Q4Fi6iBy

E6 Text Book Of Pediatric Nursing 3rd Panchali Pal — Part 1 (pp 36-238 of 713) p. 190-192

E6 Ghai Essential Pediatrics(pp 26-904 of 913) p. 168-170

Practise the full HPSSC - 2015

Attempt every question from this paper in a timed mock, then review the full solution for each one.