Yes, a CT scan with contrast can be safely performed in this patient.
With a creatinine of 1.18 mg/dL and eGFR of 80 mL/min/1.73 m², this 41-year-old man has normal to mildly reduced kidney function (CKD Stage 2), and the risk of contrast-induced acute kidney injury (CI-AKI) is extremely low—contrast-enhanced CT should proceed without hesitation if clinically indicated 1.
Risk Assessment Framework
Your patient's kidney function places him in a low-risk category:
- eGFR 80 mL/min/1.73 m² = CKD Stage 2 (mild reduction)
- Creatinine 1.18 mg/dL = essentially normal for a 41-year-old male
The ACR Appropriateness Criteria explicitly state that in chronic kidney disease (CKD), the risk-benefit ratio is determined by the level and acuity of kidney disease 1. At this level of kidney function, the benefits of obtaining diagnostic information far outweigh any theoretical risk.
Evidence-Based Risk Stratification
The most recent large-scale evidence demonstrates:
No significant CI-AKI risk at eGFR >45 mL/min/1.73 m²: A 2025 multicenter study of 182,170 matched CT scans found no statistically significant risk of CI-AKI in the general population. Risk only became significant at eGFR <45 mL/min/1.73 m² 2.
Your patient's eGFR of 80 is well above this threshold, placing him in the safest category.
Multiple propensity-score-matched studies confirm that at eGFR levels of 60-89 mL/min/1.73 m² (which includes your patient), there is no increased odds of AKI compared to non-contrast CT 3.
Practical Clinical Approach
Proceed with contrast-enhanced CT without special precautions:
- No pre-hydration required at this eGFR level
- No need to hold metformin (if applicable) at eGFR >45 mL/min/1.73 m²
- No post-contrast creatinine monitoring needed unless clinically indicated for other reasons
- Use standard contrast volumes as per imaging protocol
Important Caveats
While the contrast itself poses minimal risk, assess for:
- Acute kidney injury (AKI): If this creatinine represents an acute rise from baseline, contrast should be avoided unless absolutely necessary 1
- Other nephrotoxic medications: NSAIDs, aminoglycosides, or other nephrotoxins increase risk independently
- Volume depletion: Ensure adequate hydration status, though formal IV hydration protocols are unnecessary at this eGFR
The Contrast-Induced Nephropathy Controversy
Recent evidence has challenged the traditional concept of contrast-induced nephropathy. A 2026 critical review found that many patients labeled as having "CI-AKI" actually experience natural fluctuations in kidney function unrelated to contrast 4. Studies show that eGFR naturally varies by an average of 4.8 mL/min/1.73 m² over 3 days, with 45.8% of patients showing changes >±10 mL/min/1.73 m² regardless of contrast exposure 5.
The key distinction: Significant CI-AKI risk emerges primarily in emergency/inpatients with eGFR <30 mL/min/1.73 m² 4. Your patient is nowhere near this threshold.
Bottom Line
At eGFR 80 mL/min/1.73 m², the risk of withholding or delaying a clinically indicated contrast-enhanced CT far exceeds any theoretical risk of contrast nephrotoxicity. Proceed with the scan 1, 2, 3.