Hepatic Artery Resistance Index Calculator

Calculate hepatic artery resistance index (RI) from Doppler waveform: RI = (Peak Systolic Velocity − End Diastolic Velocity) / Peak Systolic Velocity. Normal 0.55–0.75. Post-transplant monitoring tool.

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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.
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How It Works

Calculate hepatic artery resistance index (RI) from Doppler waveform: RI = (Peak Systolic Velocity − End Diastolic Velocity) / Peak Systolic Velocity. Normal 0.55–0.75. Post-transplant monitoring tool

Each component has a specific meaning:

  • Doppler waveform: RI = / Peak Systolic Velocity — The doppler waveform: ri = / peak systolic velocity recorded for the scenario being assessed.

Note: Interpret the hepatic artery ri result against the thresholds and context described above.

How to Use

Enter the Doppler waveform: RI = / Peak Systolic Velocity for the scenario you are assessing. Calculate hepatic artery resistance index (RI) from Doppler waveform: RI = (Peak Systolic Velocity − End Diastolic Velocity) / Peak Systolic Velocity. Normal 0.55–0.75. Post-transplant monitoring tool. Use the hepatic artery ri result to inform your calculation.

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Frequently Asked Questions