Clinical Calculators for VUR Resolution
Estimation of Spontaneous Resolution in Primary Pediatric Vesicoureteral Reflux
Background & Methodology
This page provides two predictive tools to stratify the likelihood of spontaneous improvement or resolution in primary vesicoureteral reflux (VUR), separated by the patient’s age at diagnosis.
1. The VURx Calculator (< 24 months): Based on the Vesicoureteral Reflux Index developed by Kirsch et al. It calculates a cumulative score utilizing four non-invasive variables: Sex, VUR Timing on VCUG, Ureteral Anomalies, and highest VUR Grade. Lower scores consistently indicate a higher probability of spontaneous resolution.
2. The AUA Lookup Table (> 2 years): Utilizes data extracted directly from the American Urological Association (AUA) Guidelines matrices, providing a year-by-year cumulative probability based on Age, Laterality, and Grade.
Clinical Validation
The VURx model has been externally validated in a multi-institutional cohort of children diagnosed before 24 months of age. Validation follow-up was defined by the completion of ≥2 VCUGs, meaning resolution rates reflect sequential imaging assessments rather than a strict chronological timeframe.
VURx Score (Patients < 24 months)
Results
Total VURx Score: / 6
Estimated Probability of Resolution:
Background & Methodology: AUA Guidelines
This predictive tool utilizes the data matrices published in the American Urological Association (AUA) Guidelines for the Management and Screening of Primary Vesicoureteral Reflux in Children.
Unlike point-based scoring systems, this lookup table provides cumulative spontaneous resolution probabilities across a 5-year timeframe, specifically stratified by three key clinical variables in older children:
- Age at Diagnosis: Categorized into 2-5 years and 5-10 years.
- Laterality: Unilateral versus Bilateral.
- Highest VUR Grade: Grades I through V.
Clinical Validation
The percentages reflect a robust synthesis of the urological literature, incorporating foundational nomogram data (such as Estrada et al., 2009). This provides an evidence-based standard for expectant management and surgical decision-making in children over 24 months of age.
AUA Resolution Table (Patients > 2 years)
Cumulative Resolution Probability
| Year 1 | Year 2 | Year 3 | Year 4 | Year 5 |
|---|---|---|---|---|
| – | – | – | – | – |