URR measures the proportional fall in urea concentration across a dialysis treatment.
URR Calculator - Urea Reduction Ratio
URR Form
Results
Urea reduction ratio (URR)
0%
Table of Contents
1
What is URR Calculator?
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How to Use This Calculator
- Enter or select Pre-dialysis urea level, Post dialysis urea level.
- Check the unit beside each measurement. For a percentage or rate, use the scale and time period stated in the form.
- Choose Calculate, then compare the output with the formula and example below. If you change a value or option, calculate again to update the result.
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Formula Used
URR = (pre-dialysis urea−post-dialysis urea)/pre-dialysis urea × 100
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Variables Explained
| Input | What it means |
|---|---|
| Pre-dialysis urea level | Use the observed finding or laboratory value for this criterion, following the definition shown in the form. |
| Post dialysis urea level | Use the observed finding or laboratory value for this criterion, following the definition shown in the form. |
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Worked Example
Urea falling from 20 to 7 in matching units gives URR=65%.
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Why Use This Calculator?
Use the calculation to make the method and its inputs easier to check with a healthcare professional. Its meaning depends on the clinical setting and on whether the underlying method is appropriate for that person.
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Common Mistakes
- Sampling timing affects the result; URR is one part of dialysis adequacy assessment.
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Frequently Asked Questions
Is this result a diagnosis or treatment instruction?
No. It describes a calculation or score from the supplied information. A qualified clinician must check the measurements, the method’s applicability and the wider clinical picture.
Can I enter the units from any lab report?
Use the units specified in the form and select a conversion only where the page provides one. Different substances need different conversion factors; a mismatch can produce a plausible but incorrect result.
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Sources & References
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