# A nurse is assessing a 1-day-old newborn for signs of pathological jaundice. > source: MyMerci (mymerci.kr) > url: https://mymerci.kr/pages/nclex_q.php?qn_id=543276 > language: ko > subject: Maternal Newborn Health ## 문제 A nurse is assessing a 1-day-old newborn for signs of pathological jaundice. ## 보기 1. Jaundice appearing on the face and extending to the chest 2. Serum bilirubin level of 8 mg/dL at 48 hours of age is within the physiological range. 3. Jaundice appearing within the first 24 hours of life with lethargy **✔ 정답** 4. Yellow discoloration of the sclera and mucous membranes is a common sign of jaundice. **정답: 3** ## 해설 Jaundice within first 24 hours with lethargy indicates severe pathological hyperbilirubinemia requiring immediate intervention to prevent kernicterus. Other findings are less urgent or physiological. ## 심화 해설 Understanding the Question This question tests the ability to differentiate between physiological jaundice and pathological jaundice in a newborn. While jaundice is a common finding in neonates, specific characteristics in its onset, clinical presentation, and bilirubin levels signal a potentially dangerous underlying pathology that requires immediate intervention. Analysis of the Correct Answer (Option 3) The correct answer is 3: Jaundice appearing within the first 24 hours of life with lethargy. This presentation is a hallmark of pathological jaundice for two critical reasons. First, the appearance of jaundice within the first 24 hours is always considered pathological and is often associated with hemolytic disease, such as ABO or Rh incompatibility [1]. In a healthy term newborn, the liver is immature and begins conjugating bilirubin, leading to a gradual rise in serum levels that peaks around day 3 to 5 of life. The presence of visible jaundice on day 1 indicates an overwhelming bilirubin load that the liver cannot handle, usually from excessive red blood cell destruction. Second, the presence of lethargy is a significant neurological red flag. High serum levels of bilirubin, specifically unconjugated bilirubin, can cross the immature blood-brain barrier and deposit in the basal ganglia, leading to bilirubin-induced neurological dysfunction (BIND) [2]. Lethargy, along with poor feeding and hypotonia, is an early clinical sign of this neurotoxicity and can progress to irreversible kernicterus, resulting in permanent brain damage, developmental delays, and hearing impairment [2][3]. Analysis of the Incorrect Options • **Option 1:** Jaundice appearing on the face and extending to the chest describes the typical cephalocaudal progression of physiological jaundice. In physiological cases, bilirubin levels rise slowly enough that the initial deposition is noticed first in the face before moving downward. This finding alone, without a specified time of onset or concerning symptoms, is a common and expected finding in a healthy newborn [1]. • **Option 2:** A serum bilirubin level of 8 mg/dL at 48 hours of age is within the physiological range. Clinicians use nomograms based on gestational age and hours of life to determine risk, but a total serum bilirubin level of 8 mg/dL at 48 hours is generally well below phototherapy thresholds for a healthy term infant and represents a normal physiological process [1]. • **Option 4:** Yellow discoloration of the sclera and mucous membranes is a common sign of jaundice. The statement itself is factually correct; jaundice is defined as a yellowish discoloration of the skin, sclerae, and mucous membranes caused by tissue deposition of pigmented bilirubin [1]. However, this describes the general clinical sign of jaundice and does not differentiate between a physiological and a pathological etiology. The question requires identifying the finding that is specifically indicative of a pathological process.References (research sources) - [1]Jaundice: Newborn to Age 2 MonthsResearch articleDebra H. Pan, Yolanda Rivas (2017) · DOI: 10.1542/pir.2015-0132 - [2]Neonatal Hyperbilirubinemia in Uganda: Mechanisms, Clinical Consequences, and Health-System Challenges.Research articleHamdi MY, Nankunda J, Hassan HA, Said ZA, Mohamud AH, Kahie FD, Abdulla AM, Moalim JA, Moalim MA, Elfakey WEM. (2025) · DOI: 10.2147/phmt.s530595 - [3]The prevalence of neonatal jaundice and risk factors in healthy term neonates at National District Hospital in BloemfonteinResearch articleHanneke Brits, J. Adendorff, Dyanti Huisamen, Dahne Beukes, Kristian Botha, Hanre Herbst (2018) · DOI: 10.4102/phcfm.v10i1.1582 ## 임상 시나리오 Identifying Pathological JaundiceKey assessment findings in the first 24 hours Any jaundice appearing within the first 24 hours of life is pathological until proven otherwise. This is a medical emergency often linked to hemolytic disease (e.g., ABO or Rh incompatibility). The presence of lethargy, poor feeding, or hypotonia alongside jaundice is a critical red flag. These are early signs of bilirubin-induced neurological dysfunction (BIND), indicating that unconjugated bilirubin may be crossing the blood-brain barrier. CautionDo not wait for jaundice to spread to the trunk or for a high bilirubin level to act. The combination of early onset and neurological signs requires immediate intervention, including intensive phototherapy or exchange transfusion. ## 핵심 개념 - **Pathological Jaundice** — Jaundice appearing in the first 24 hours of life, often due to hemolysis, with rapidly rising bilirubin levels posing a neurotoxicity risk. - **Bilirubin-Induced Neurological Dysfunction (BIND)** — A spectrum of neurological damage caused by unconjugated bilirubin crossing the blood-brain barrier, presenting with early signs like lethargy and poor feeding. - **Hemolytic Disease of the Newborn** — A condition where maternal antibodies cross the placenta and destroy fetal red blood cells, leading to severe hyperbilirubinemia, commonly from ABO or Rh incompatibility. ## 같은 주제 문제 - [A nurse is assessing a 3-day-old newborn for signs of pathological hyperbilirubinemia. Whi…](https://mymerci.kr/pages/nclex_q.php?qn_id=543275) - [A nurse is assessing a 1-week-old infant for signs of pathological jaundice. 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