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Compares a measured bilirubin with the hour-specific phototherapy threshold you read from the AAP chart, since those thresholds are tabulated data rather than a formula.
Threshold comparison
Percent of threshold = bilirubin / phototherapy threshold x 100; thresholds depend on age in hours, gestation and neurotoxicity risk factors
Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
The AAP 2022 hyperbilirubinaemia guideline provides curves by gestational age and neurotoxicity risk factors.
Bilirubin rises rapidly in the first days, so the same value means very different things at 24 and 96 hours.