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Newborn Jaundice Risk Calculator

Work out newborn jaundice risk instantly with clear inputs, formula shown and shareable results.

About Newborn Jaundice Risk Calculator

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.

Formula

Threshold comparison

Percent of threshold = bilirubin / phototherapy threshold x 100; thresholds depend on age in hours, gestation and neurotoxicity risk factors

Worked example

With the default values below, Newborn Jaundice Risk Calculator returns Bilirubin as a share of the threshold of 80.0%. Change any input above and every figure here is recalculated in your browser.

Inputs used

Total serum bilirubinaccepts 1–40 mg/dL
12 mg/dL
Ageaccepts 0–336 h
48 h
Phototherapy threshold from the chartaccepts 4–30 mg/dL
15 mg/dL

Results

Bilirubin as a share of the threshold
80.0%
Distance below the threshold
3.00 mg/dL
Risk band
Comfortably below the threshold
Age in days
2.00

Step by step

  1. 1Values used
  2. 2Threshold comparison
  3. 3Bilirubin as a share of the threshold= 80.0
  4. 4Distance below the threshold= 3.00 mg/dL
  5. 5Risk band= Comfortably below the threshold
  6. 6Age in days= 2.00

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
  • This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

Frequently Asked Questions

Where do the thresholds come from?

The AAP 2022 hyperbilirubinaemia guideline provides curves by gestational age and neurotoxicity risk factors.

Why use age in hours?

Bilirubin rises rapidly in the first days, so the same value means very different things at 24 and 96 hours.

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