Newborn Hyperbilirubinemia Assessment Calculator

Neonatal jaundice management relies on plotting a newborn's total serum bilirubin (TSB) against their exact postnatal age in hours, factoring in specific clinical risk modifiers. The calculation uses threshold algorithms such as PT(age, risk, gestation) to identify the phototherapy requirement level, and TT(age, risk, gestation) to find the exchange transfusion trigger. Additionally, percentile reference lines like the 95th, 75th, and 40th percentiles are evaluated to grade the severity of hyperbilirubinemia relative to standard normative growth curves for gestational age.

Consider a newborn infant who is exactly 48 hours old, born at 38 weeks of gestation, and categorized with moderate risk factors (such as mild hemolysis or sibling jaundice history). Suppose their lab test reveals a total serum bilirubin level of 12.5 mg/dL. 1. Determine postnatal age: 48 hours. 2. Assess gestational age: 38 completed weeks. 3. Query the phototherapy threshold function PT(48, moderate_risk, 38_weeks), which yields a clinical limit of approximately 11.5 mg/dL. 4. Because the infant's bilirubin of 12.5 mg/dL exceeds the 11.5 mg/dL phototherapy threshold, the calculation indicates that phototherapy intervention is warranted to safely reduce bilirubin levels.

Always input the infant's age strictly in hours rather than days to ensure precision, as bilirubin thresholds shift rapidly during the first week of life. Verify that risk factors (such as gestational age and hemolytic disease status) are accurately entered, as they significantly alter treatment curves. This tool is designed to support clinical judgment and should never replace direct evaluation by a qualified pediatrician or neonatologist.