Dialysis Adequacy (URR + Kt/V)
Hemodialysis adequacy: urea reduction ratio (URR) and the Daugirdas second-generation single-pool Kt/V against the KDOQI minimum targets (Daugirdas 1993).
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Pre-dialysis BUN
- 60 mg/dL
- Post-dialysis BUN
- 18 mg/dL
- Ultrafiltration volume
- 3 L
- Dialysis session time
- 4 h
- Post-dialysis weight
- 70 kg
Result: URR 70% (KDOQI target >= 65%: met); single-pool Kt/V 1.44 (KDOQI target >= 1.2: met).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- URR
- (1 - post-BUN/pre-BUN) x 100%; KDOQI minimum >= 65%.
- spKt/V
- -ln(R - 0.008·t) + (4 - 3.5·R)·UF/W, R = post/pre BUN; KDOQI minimum >= 1.2 (thrice-weekly). Prescriptions vary.
What you enter
- Pre-dialysis BUN
- Post-dialysis BUN
- Ultrafiltration volume
- Dialysis session time
- Post-dialysis weight
How this is calculated
Daugirdas JT. Second generation logarithmic estimates of single-pool variable volume Kt/V: an analysis of error. J Am Soc Nephrol. 1993;4(5):1205-1213. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.
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