Clinical Decision Support

Clinical guidance for neonatal jaundice management

A practical reference based on AAP 2022 and NICE CG98, focused on phototherapy decisions, escalation of care, exchange transfusion, IVIG, and post-treatment monitoring.

Open bilirubin calculator Track trend

Clinical decision support only. It does not replace bedside assessment, local hospital protocols, neonatal consultation, or emergency judgment.

AAP scope≥ 35 weeks

Applies up to 336 hours of age, using gestational-age curves and neurotoxicity risk status.

NICE scope< 28 days

Covers newborn babies under 28 days, including assessment, treatment, and prolonged jaundice.

Unit conversion1 mg/dL = 17.104 µmol/L

Always verify the laboratory unit before data entry and result interpretation.

01 · Clinical workflow

Safe bilirubin assessment flow

Confirm age in hours

Calculate from birth time to sample time. Hour errors can shift the treatment threshold.

Enter TSB/TcB with the correct unit

Use total bilirubin. For treatment decisions, prioritize TSB according to local laboratory policy.

Select gestational age

AAP uses curves for infants ≥35 weeks; NICE uses thresholds by postnatal age and gestation.

Mark risk factors

Separate AAP neurotoxicity risk factors from NICE clinical risk factors.

Use the lower threshold

BiliTool.Vn calculates both guideline pathways and shows the deciding guideline for transparency.

Plan follow-up

Base repeat testing on distance from threshold, rate of rise, rebound risk, and clinical condition.

02 · AAP 2022

Neurotoxicity risk factors

When present, treatment and escalation thresholds are lower. Lower gestational age is already handled by the selected gestational-age curve and should not be double-counted.

Serum albumin < 3.0 g/dL when measured or when the infant reaches escalation-of-care range.

Isoimmune hemolytic disease, G6PD deficiency, or other known or suspected hemolytic condition.

Confirmed or suspected sepsis.

Significant clinical instability during the previous 24 hours.

Rate of rise suggesting hemolysis: >0.3 mg/dL/hour in the first 24 hours or >0.2 mg/dL/hour thereafter.

03 · Intervention levels

Interpretation and action

Monitor

Below phototherapy threshold

Consider distance from threshold, age in hours, gestational age, feeding, weight loss, jaundice in the first 24 hours, and reliable follow-up.

Phototherapy

TSB reaches threshold

Start phototherapy according to local protocol. Ensure irradiance, exposed skin area, eye protection, thermal monitoring, hydration, and feeding support.

Escalation

Within 2 mg/dL of exchange threshold

AAP defines escalation of care when TSB is 2 mg/dL below the exchange transfusion threshold. Resuscitation, intensive phototherapy, labs, and consultation are needed.

Emergency

At exchange threshold or encephalopathy

Prepare exchange transfusion and urgent neonatal or intensive-care consultation. Do not delay if acute bilirubin encephalopathy is suspected.

04 · NICE CG98

Monitoring, stopping treatment, and IVIG

Recognition

Examine under good light. Skin color change may be harder to detect in darker skin. Jaundice in the first 24 hours requires urgent assessment.

Stop phototherapy

Consider stopping when bilirubin is at least 50 µmol/L below the phototherapy threshold, then check rebound after 12–18 hours as recommended by NICE.

IVIG

Consider IVIG 500 mg/kg over 4 hours for Rh or ABO hemolytic disease when bilirubin continues to rise by more than 8.5 µmol/L/hour despite intensive phototherapy.

Prolonged jaundice

Assess jaundice lasting more than 14 days in infants ≥37 weeks, or more than 21 days in infants <37 weeks; check conjugated bilirubin and underlying causes.

05 · Red flags

Findings requiring urgent action

Jaundice in the first 24 hoursPoor feeding, lethargy, hypotonia, or hypertoniaHigh-pitched cry, arching, or seizuresFever, hypothermia, or suspected sepsisAnemia, hepatosplenomegaly, or dark urineRapidly rising TSB or close to exchange threshold

06 · AAP 2022 quick table

Reference phototherapy thresholds (mg/dL)

Abbreviated table for quick checking. Use the calculator with exact age in hours and clinical context for treatment decisions.

A. No neurotoxicity risk factors

Age	35 weeks	36 weeks	37 weeks	38 weeks	39 weeks	≥40 weeks
12 hours	6.1	7.1	8.1	9.1	9.8	10.4
24 hours	10.6	11.4	11.7	12.3	12.8	13.3
48 hours	14.2	15.3	15.7	16.0	16.5	17.0
72 hours	16.8	17.8	18.3	18.8	19.3	19.8
96 hours	18.6	19.5	20.0	20.7	21.3	21.8
120 hours	19.7	20.5	21.0	21.6	22.1	22.6
≥144 hours	20.0	20.8	21.3	22.0	22.5	23.0

B. With neurotoxicity risk factors

Age	35 weeks	36 weeks	37 weeks	38 weeks	39 weeks	≥40 weeks
12 hours	4.3	5.2	6.1	7.1	7.8	8.5
24 hours	8.9	9.5	10.0	10.5	10.5	10.5
48 hours	12.2	13.0	13.5	14.0	14.0	14.0
72 hours	14.6	15.3	15.8	16.6	16.6	16.6
96 hours	16.1	16.9	17.4	18.2	18.2	18.2
120 hours	17.0	17.8	18.3	19.1	19.1	19.1
≥144 hours	17.5	18.3	18.8	19.5	19.5	19.5

07 · Primary sources

References

AAP 2022Kemper AR, et al. Pediatrics 2022;150(3):e2022058859. NICE CG98Jaundice in newborn babies under 28 days. Last updated 31 October 2023. DisclaimerRead BiliTool.Vn safety principles and usage limits.