Management of Severe Hyperbilirubinemia in Late Preterm Infants

Diagnosis and Initial Management

The American Academy of Pediatrics recommends immediate intensive phototherapy and preparation for possible exchange transfusion for late preterm infants with bilirubin levels approaching the exchange transfusion threshold, as this level poses a significant risk for bilirubin-induced neurologic dysfunction 1
Admit infants with severe hyperbilirubinemia immediately to a hospital pediatric service for intensive phototherapy, bypassing the emergency department to avoid delays in treatment initiation 2
Exchange transfusions should only be performed by trained personnel in a neonatal intensive care unit with full monitoring and resuscitation capabilities, due to the associated risks of mortality and morbidity 2

Obtain total serum bilirubin and direct bilirubin levels to confirm the degree of hyperbilirubinemia, as well as blood type, direct antibody test, serum albumin level, complete blood count with differential, blood smear, and reticulocyte count to assess for hemolysis and identify underlying causes 2, 3
The American Academy of Pediatrics recommends G6PD testing for infants with late-rising bilirubin, as G6PD deficiency is a common cause of hemolytic disease in this population 4

Use special blue fluorescent tubes or LED lights delivering irradiance >30 μW/cm²/nm for intensive phototherapy, with the goal of reducing total serum bilirubin levels by >2 mg/dL within 4-6 hours 5
Change the infant's position every 2-3 hours to maximize skin surface exposure to phototherapy, and avoid physical obstruction from equipment or other sources 5
If isoimmune hemolytic disease is identified, administer intravenous immunoglobulin 0.5-1 g/kg over 2 hours, which has been shown to reduce the need for exchange transfusions in Rh and ABO hemolytic disease 2

Monitor infants with severe hyperbilirubinemia for signs of acute bilirubin encephalopathy, including lethargy, hypotonia, poor sucking, and other neurologic abnormalities, and perform emergency exchange transfusion if necessary 7
Measure total serum bilirubin levels regularly, with the frequency of measurement depending on the infant's bilirubin level and risk factors, to assess the effectiveness of treatment and adjust the treatment plan as needed 2
Discontinue phototherapy when total serum bilirubin levels are <13-14 mg/dL, and measure total serum bilirubin levels 24 hours after discharge to check for rebound, depending on the underlying cause 2