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Jaundice in the healthy newborn infant: a new approach to an old problem
M J Maisels1, K Gifford, C E Antle
1Department of Pediatrics, Pennsylvania State University College of Medicine, Hershey.
Insights
Newborn jaundice exceeding 12.9 mg/dL is strongly linked to breastfeeding and weight loss. Understanding these risk factors helps determine when jaundice requires further investigation, suggesting a need for revised definitions of physiologic jaundice.
Area of Science:
- Neonatal Medicine
- Pediatrics
- Clinical Chemistry
Background:
- Hyperbilirubinemia is common in newborns.
- Distinguishing physiologic from nonphysiologic jaundice is crucial for appropriate management.
- Current definitions of physiologic jaundice may not encompass all clinical scenarios.
Purpose of the Study:
- To identify risk factors associated with elevated serum bilirubin levels in newborns.
- To evaluate the need for laboratory investigations based on identified risk factors.
- To propose a more rational approach to managing neonatal jaundice.
Main Methods:
- Serum bilirubin concentrations were measured in 2,416 infants.
- Infants with maximal serum bilirubin > 12.9 mg/dL were compared to controls with levels ≤ 12.9 mg/dL.
- Risk ratios were calculated for various associated variables.
Main Results:
- Elevated serum bilirubin (> 12.9 mg/dL) was strongly associated with breastfeeding and percentage of weight loss.
- Other associated factors included maternal diabetes, oriental race, decreased gestational age, male sex, bruising, and oxytocin induction.
- Risk calculations indicated that "nonphysiologic" jaundice may develop in certain infants without immediate need for lab tests.
Conclusions:
- Breastfeeding and significant weight loss are key indicators for elevated newborn bilirubin.
- Awareness of risk factors allows for a more rational approach to investigating neonatal jaundice.
- A revised definition of physiologic jaundice is needed to better guide clinical practice.
Abstract:
We measured the serum bilirubin concentrations in 2,416 consecutive infants admitted to our well baby nursery. The maximal serum bilirubin concentration exceeded 12.9 mg/dL (221 mumol/L) in 147 infants (6.1%), and these infants were compared with 147 randomly selected control infants with maximal serum bilirubin levels less than or equal to 12.9 mg/dL. A serum bilirubin concentration greater than 12.9 mg/dL was associated strongly with breast-feeding (P = .0000) and percentage of weight loss after birth (P = .0001), as well as with maternal diabetes, oriental race, decreased gestational age, male sex, bruising, and induction of labor with oxytocin. Risk ratios and the risk of jaundice were calculated for hypothetical infants in the presence and absence of these variables. These calculations show that, in certain infants, "nonphysiologic" jaundice is likely to develop and its presence in such infants might not require laboratory investigations. In others, a modest degree of hyperbilirubinemia could be cause for concern. An awareness of these factors and their potential contribution to serum bilirubin levels permits a more rational approach to the action levels used for the investigation of jaundice in the newborn. We need a new definition of physiologic jaundice.