# AI calculates a pediatric medication dose using birth weight instead of actual body weight for a premature infant in the NICU, leading to tenfold overdose risk

- **ID:** `medical/neonatal-weight-based-dose-miscalculation`
- **Domain:** medical
- **Category:** data_error
- **Error Code:** `MED-DOSE-001`
- **Verification:** ai_generated
- **Fix Rate:** 75%

## Root Cause

Many NICU medication protocols require current weight (updated daily) for dose calculation, but AI often defaults to birth weight stored in the patient record, causing up to 10x overdose for drugs with narrow therapeutic index like gentamicin or caffeine citrate.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| Epic 2023.1.2 | active | — | — |
| Cerner Millennium 2018.03 | active | — | — |
| NeoFax 2023.1 | active | — | — |

## Workarounds

1. **Implement automated weight reconciliation: ALWAYS query the most recent weight value from the EMR within the last 24 hours. Example SQL: SELECT weight_kg FROM patient_weights WHERE patient_id = @pid AND recorded_at >= DATEADD(hour, -24, GETUTCDATE()) ORDER BY recorded_at DESC LIMIT 1** (92% success)
   ```
   Implement automated weight reconciliation: ALWAYS query the most recent weight value from the EMR within the last 24 hours. Example SQL: SELECT weight_kg FROM patient_weights WHERE patient_id = @pid AND recorded_at >= DATEADD(hour, -24, GETUTCDATE()) ORDER BY recorded_at DESC LIMIT 1
   ```
2. **Add a hard-coded validation rule: if dose_calc_weight < 0.5 kg OR dose_calc_weight > 10 kg for preterm, flag as RED. Also require manual override with reason (e.g., 'edema weight')** (88% success)
   ```
   Add a hard-coded validation rule: if dose_calc_weight < 0.5 kg OR dose_calc_weight > 10 kg for preterm, flag as RED. Also require manual override with reason (e.g., 'edema weight')
   ```

## Dead Ends

- **Use birth weight for all preterm infants because weight loss after birth is normal** — Birth weight does not reflect fluid shifts, postnatal weight loss, or actual metabolic capacity; using it can cause overdose of renally cleared drugs (85% fail)
- **Round all doses to the nearest whole milligram for easier administration** — Neonatal doses are often in micrograms or sub-milligram range; rounding can cause 50-200% dosing errors (70% fail)
- **Use weight at admission for entire hospital stay** — Preterm infants can lose 10% body weight in first week and then gain rapidly; weight must be updated daily for accurate dosing (90% fail)