Urea Reduction Ratio (URR)

What is URR?

URR stands for urea reduction ratio, meaning the reduction in urea as a result of dialysis. The URR is one measure of how effectively a dialysis treatment removed waste products from the body and is commonly expressed as a percentage.
The URR is usually measured only once every 12 to 14 treatments, which is once a month. The URR may vary considerably from treatment to treatment.

Calculated as:
URR=100%×(pre dialysis BUN−post dialysis BUN)/pre dialysis BUN

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