🩺 Residual Renal Urea Clearance (KRU)
UseWhen to use: incremental dialysis / adequacy when residual urine output persists.
StrataMeaningful KRU contributes to weekly clearance — include it in dialysis dosing decisions.
LimitsWhen not to use: incomplete collection. · Pitfall: mismatched urea units. · Mean plasma urea preferred.
SourceStandard residual urea clearance teaching formula
This-shift next steps
After scoring: open the scene pack, peer scores, and the matching pathway. Local reference — no HIS write.
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Methodology · worked example, guidelines & full notes
(U×V)/(P×t).
When to use
When to use: incremental dialysis / adequacy when residual urine output persists.
How it works
KRU = (Uurea × Vurine) / (Purea × t).
Key points
- (U×V)/(P×t).
- Residual clearance.
- Next: stdKt/V / volume status.
References
- Standard residual urea clearance teaching formula
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Urine urea / BUN | 200 same as plasma |
|---|---|
| Mean plasma urea / BUN | 50 same units |
| Urine volume | 800 mL |
| Collection time | 1440 min |
→KRU2.22mL/min
- Collection：24.0 h
- Cue：>=2 mL/min — meaningful residual clearance cue
Verification & sources · governance
FAQ
Frequently asked questions
- Does Residual Renal Urea Clearance (KRU) upload patient data? Where is it calculated?
- Calculation runs locally in the browser; inputs and results are not uploaded. For licensed clinicians only; interpret with history, investigations and local protocols — not a diagnosis or prescription.
- How is Residual Renal Urea Clearance (KRU) calculated in practice? Can you show a worked example?
- Inputs: Urine urea / BUN 200 same as plasma, Mean plasma urea / BUN 50 same units, Urine volume 800 mL, Collection time 1440 min → Result: KRU 2.22 mL/min（Collection: 24.0 h, Cue: >=2 mL/min — meaningful residual clearance cue）