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Preterm bilirubin thresholds, under 35 weeks

Modified consensus guidelines — Stavis & Guida, J Perinatol 2026. Maisels/Watchko/Bhutani/Stevenson consensus thresholds interpolated by postmenstrual age, with the AAP 2022 high-risk 35-week phototherapy curve substituted wherever it is lower, plotted against chronologic age from birth. Draft evaluation tool. Not validated for clinical use.

Gestational age at birth
wk d
Age now
d h
Most recent bilirubin
mg/dL
Units

Thresholds at day 1

The guidelines define these two thresholds only. Irradiance, surface area, when to stop phototherapy, and how often to recheck are not specified and remain local policy.

Neurotoxicity risk — low risk

Bilirubin course

Bilirubin values

Day
Hour
TSB (mg/dL)