RRI — Renal Resistive Index by Doppler Ultrasound

Calculate the Renal Resistive Index (RRI = (Peak Systolic Velocity − End-Diastolic Velocity) / Peak Systolic Velocity) from renal Doppler ultrasound to assess renal vascular resistance and predict AKI reversibility.

Weight
Height
Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
Advertisement

How It Works

Calculate the Renal Resistive Index (RRI = (Peak Systolic Velocity − End-Diastolic Velocity) / Peak Systolic Velocity) from renal Doppler ultrasound to assess renal vascular resistance and predict AKI reversibility

Each component has a specific meaning:

  • Renal Doppler ultrasound — The renal doppler ultrasound recorded for the scenario being assessed.

Note: Interpret the renal resistive index result against the thresholds and context described above.

How to Use

Enter the renal Doppler ultrasound for the scenario you are assessing. Calculate the Renal Resistive Index (RRI = (Peak Systolic Velocity − End-Diastolic Velocity) / Peak Systolic Velocity) from renal Doppler ultrasound to assess renal vascular resistance and predict AKI reversibility. Use the renal resistive index result to inform your calculation.

Frequently Asked Questions