Bilirubin Risk Index*

Variable	Points	This Infant's Score
Exclusive Breast Feeding at discharge	6
Previous infant with jaundice needing phototherapy or more	6
Bruising	4
Asian Race	4
Cephalhematoma	3
Mother ³ 25 years old	3
Male sex	1
Gestational age**	2 * (40 - GA)

TOTAL SCORE _________ % ile _______

**The score is calculated as the sum of all characteristics that apply to the patient, except that points for gestational age are assigned based on twice the difference from 40 weeks. For example, a 37 week bottle-fed Asian male whose mother was 30 years old would receive a score of 14: 6 (for gestational age = 2*(40-37)) + 4 (for Asian) + 1 (male) + 3 (mother > 25 yr).

Score	Percen-tiles	Likeli-hood Ratio	Posterior Probability (Positive predictive value)	Approximate Posterior Probability as a fraction: 1 in
<= 7	1-32%	0.053	0.00006	15653
8-10	33-61%	0.36	0.00043	2327
11-15	62-90%	1.5	0.0019	540
16-20	91-98%	3.3	0.0040	251
>20	99%	18.2	0.022	47

*Based on Newman TB et al, Arch Peds Adol Med 2000;154:1140-47. Updated 6/16/08, deleting Black race, because it turns out that while at lower risk of bilirubin levels ≥ 20 mg/dL, black infants have the same risk of bilirubin levels ≥ 25 mg/dL, and may be at higher risk for levels ≥ 30 mg/dL.