# AI fails to flag contrast-induced nephropathy risk for a patient with eGFR <30 mL/min/1.73m² scheduled for CT with IV iodinated contrast, no prophylaxis ordered

- **ID:** `medical/ct-contrast-renal-function-check-skip`
- **Domain:** medical
- **Category:** config_error
- **Error Code:** `MED-CT-CIN-001`
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

Contrast-induced nephropathy (CIN) is a known risk in advanced CKD (eGFR <30). Guidelines mandate withholding metformin, using iso-osmolar contrast, and considering IV hydration prophylaxis, but AI order sets often lack automated eGFR checks before contrast orders.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| Radimetrics 2.4 | active | — | — |
| PACS GE Centricity 6.0 | active | — | — |
| Nuance mPower 2.0.1 | active | — | — |

## Workarounds

1. **Implement automated eGFR check at order entry: IF eGFR < 30 THEN display alert: 'eGFR <30: CIN risk. Consider iso-osmolar contrast, IV hydration (0.9% NaCl 1 mL/kg/h for 12h pre/post), hold metformin for 48h.' Require radiologist override with reason.** (90% success)
   ```
   Implement automated eGFR check at order entry: IF eGFR < 30 THEN display alert: 'eGFR <30: CIN risk. Consider iso-osmolar contrast, IV hydration (0.9% NaCl 1 mL/kg/h for 12h pre/post), hold metformin for 48h.' Require radiologist override with reason.
   ```
2. **Add a mandatory order set: 'CIN Prophylaxis for eGFR <30' that auto-selects iodixanol, IV fluids, and holds metformin. Example HL7 message: ORC|NW|12345||^CIN_PROPHYLAXIS_ORDER_SET** (85% success)
   ```
   Add a mandatory order set: 'CIN Prophylaxis for eGFR <30' that auto-selects iodixanol, IV fluids, and holds metformin. Example HL7 message: ORC|NW|12345||^CIN_PROPHYLAXIS_ORDER_SET
   ```

## Dead Ends

- **Use low-osmolar contrast instead of iso-osmolar for all patients to save cost** — Low-osmolar agents have higher CIN risk in eGFR <30 compared to iso-osmolar agents like iodixanol (60% fail)
- **Check only serum creatinine, ignore eGFR, because creatinine is 'more accurate'** — Serum creatinine alone is misleading in elderly, low muscle mass, or liver disease patients; eGFR is the standard for CIN risk stratification (75% fail)
- **Order CT without contrast if eGFR <30, regardless of clinical indication** — Many indications (e.g., pulmonary embolism, aortic dissection, abscess) require contrast; risk can be mitigated with hydration and iso-osmolar agent (50% fail)