# AI applies adult bilirubin nomogram to a preterm neonate, missing need for exchange transfusion

- **ID:** `medical/neonatal-bilirubin-nomogram`
- **Domain:** medical
- **Category:** runtime_error
- **Error Code:** `NEONATAL-BILI-NOMOGRAM-ERR`
- **Verification:** ai_generated
- **Fix Rate:** 85%

## Root Cause

Neonatal hyperbilirubinemia management uses gestational-age- and hour-of-life-specific nomograms (e.g., AAP Bhutani nomogram); adult bilirubin thresholds are orders of magnitude lower and inappropriate for newborns.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| AAP Bhutani Nomogram 2022 | active | — | — |
| NICE Guideline CG98 2023 | active | — | — |
| BiliTool 2.0 | active | — | — |
| NeoFax 2024 | active | — | — |

## Workarounds

1. **Use the AAP-endorsed Bhutani nomogram (https://www.aap.org/bilitool) with the infant's gestational age in weeks, hour of life, and measured total bilirubin. Plot the value to determine phototherapy or exchange transfusion threshold. Document the nomogram version used.** (92% success)
   ```
   Use the AAP-endorsed Bhutani nomogram (https://www.aap.org/bilitool) with the infant's gestational age in weeks, hour of life, and measured total bilirubin. Plot the value to determine phototherapy or exchange transfusion threshold. Document the nomogram version used.
   ```
2. **If Bhutani nomogram unavailable, use the rule of thumb: phototherapy at total bilirubin (mg/dL) = gestational age (weeks) × 0.5 for first 72 hours, but this is less accurate. Always consult local NICU protocol.** (78% success)
   ```
   If Bhutani nomogram unavailable, use the rule of thumb: phototherapy at total bilirubin (mg/dL) = gestational age (weeks) × 0.5 for first 72 hours, but this is less accurate. Always consult local NICU protocol.
   ```

## Dead Ends

- **** — Direct hyperbilirubinemia (conjugated) requires different workup for biliary atresia or hepatitis; indirect drives kernicterus risk. (70% fail)
- **** — This would trigger unnecessary phototherapy in nearly all newborns, wasting resources and separating mother-infant dyads. (95% fail)
- **** — Bilirubin neurotoxicity risk depends on gestational age and postnatal hours; weight alone is insufficient. (80% fail)