Neonatal Bilirubin Risk (Bhutani Approximation)
Approximate risk-zone for a total serum bilirubin at a given postnatal age.
What is Neonatal Bilirubin Risk (Bhutani Approximation)?
Approximate risk-zone for a total serum bilirubin at a given postnatal age. Neonatal Bilirubin Risk is intended for use in: Term and near-term newborns ≥ 35 weeks gestation.
How to Use the Neonatal Bilirubin Risk Calculator
- Enter Postnatal age in hours.
- Enter Total serum bilirubin (TSB) in mg/dL.
- Click Calculate to see your result and interpretation.
Formula & Version
This calculator uses formula version 1.0, last reviewed September 2026.
Clinical Considerations & Limitations
- This calculator linearly interpolates between a small number of published percentile reference points and is an APPROXIMATION of the original hour-specific nomogram curve — always cross-check against the official Bhutani nomogram chart for clinical decisions.
- Only intended for infants ≥ 35 weeks gestation being assessed for the risk of subsequent significant hyperbilirubinemia, not for infants already receiving phototherapy.
References
- Bhutani VK et al., Pediatrics 1999;103:6-14
Frequently Asked Questions
What is Neonatal Bilirubin Risk (Bhutani Approximation)?
Approximate risk-zone for a total serum bilirubin at a given postnatal age.
Who is Neonatal Bilirubin Risk intended for?
Term and near-term newborns ≥ 35 weeks gestation. Always confirm applicability to your specific patient before use.
What are the limitations of Neonatal Bilirubin Risk?
This calculator linearly interpolates between a small number of published percentile reference points and is an APPROXIMATION of the original hour-specific nomogram curve — always cross-check against the official Bhutani nomogram chart for clinical decisions. Only intended for infants ≥ 35 weeks gestation being assessed for the risk of subsequent significant hyperbilirubinemia, not for infants already receiving phototherapy.
What formula or reference does Neonatal Bilirubin Risk use?
Bhutani VK et al., Pediatrics 1999;103:6-14
Is Neonatal Bilirubin Risk a diagnosis?
No. Neonatal Bilirubin Risk produces a score or estimate to support clinical decision-making — it is not a diagnosis and should be interpreted alongside full clinical judgement.
