Urea Reduction Ratio (URR) Calculator

Calculate the urea reduction ratio (URR) to assess hemodialysis adequacy. URR = (pre-BUN minus post-BUN) / pre-BUN x 100. Target > 65%.

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 to Use

Enter the values for the scenario you are assessing. Calculate the urea reduction ratio (URR) to assess hemodialysis adequacy. URR = (pre-BUN minus post-BUN) / pre-BUN x 100. Target > 65%. Use the urr dialysis result to inform your calculation.

Related Calculators

Kt/V Dialysis

Medical

CRRT Dose

Medical

Frequently Asked Questions