billycalc

Newborn Bilirubin

Newborn Bilirubin: calculated with the published clinical method, with result interpretation. A reference tool that does not replace a doctor's advice.

ℹ Reference calculation based on the published method. It does not replace a clinical examination or a doctor's decision.

Newborn Bilirubin

Gestational age at birth (40 = 40 or more)weeks
Ageh
Total serum bilirubinµmol/L
Neurotoxicity risk factors other than gestational age (1 = yes)
Phototherapy threshold (AAP 2022)
273.6µmol/L
Neurotoxicity risk factors: albumin <3 g/dL, isoimmune haemolytic disease, G6PD deficiency or other haemolysis, sepsis, significant clinical instability in the previous 24 hPrematurity is accounted for by separate gestational-age curvesThresholds for newborns ≥35 weeks' gestation; assess using total serum bilirubinReference calculation; the decision rests with the physicianNewborn Bilirubin: calculated with the published clinical method, with result interpretation. A reference tool that does not replace a doctor's advice.
Assessment
Below phototherapy threshold
Phototherapy threshold
16.0mg/dL
Distance to phototherapy threshold
4.0mg/dL
Escalation-of-care threshold
376µmol/L
Exchange transfusion threshold
410µmol/L

More about: Newborn Bilirubin

What it calculates

The “Newborn Bilirubin” calculator computes Phototherapy threshold (AAP 2022) in µmol/L from 4 parameters: gestational age at birth (40 = 40 or more) (weeks), age (h), total serum bilirubin (µmol/L), neurotoxicity risk factors other than gestational age (1 = yes).

Used by professionals and patients to assess health metrics, dosages, and risks.

Example calculation

With parameters Gestational age at birth (40 = 40 or more) = 38 weeks, Age = 48 h, Total serum bilirubin = 205 µmol/L, Neurotoxicity risk factors other than gestational age (1 = yes) = 0 the result is 273.6 µmol/L (Neurotoxicity risk factors: albumin <3 g/dL, isoimmune haemolytic disease, G6PD deficiency or other haemolysis, sepsis, significant clinical instability in the previous 24 h).

How to use

  1. Enter gestational age at birth (40 = 40 or more), age, total serum bilirubin and neurotoxicity risk factors other than gestational age (1 = yes) — each field above is adjustable with a slider.
  2. Phototherapy threshold (AAP 2022) (µmol/L) is calculated automatically as you type.
  3. Check the worked example below to see the formula applied to real numbers.
  4. Copy the result or bookmark this calculator.

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FAQ

How is BMI calculated?
BMI = weight (kg) / height (m)². Example: 70 kg / (1.75 m)² = 22.9. The WHO normal range is 18.5–24.9; below that is underweight, 25–29.9 is overweight, and 30+ is obese.
Is BMI accurate for everyone?
No. BMI does not distinguish muscle from fat, so athletes may show a high BMI with low body fat. It is also less reliable for teenagers, pregnant people, older adults, and very tall or short individuals.
What are the BMI categories?
Underweight: below 18.5. Normal: 18.5–24.9. Overweight: 25–29.9. Obese class I: 30–34.9; class II: 35–39.9; class III: 40+.
What is a better measure than BMI?
Body fat percentage, waist-to-height ratio (aim for under 0.5), and waist circumference give a clearer picture of health than BMI alone.

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