Renal function
Fractional excretion of urea (FEUrea)
Use in diuretic-treated patients; cut-off ≤35% suggests pre-renal.
Required inputs
- Urine urea
- Serum BUN
- Urine creatinine
- Serum creatinine
Equation or source
Carvounis CP, Kidney Int 2002;62:2223.
Provenance and release status
- Equation / algorithm
- Use in diuretic-treated patients; cut-off ≤35% suggests pre-renal.
- Formula version
- feurea-v1
- Tool version
- 2.4.0
- Clinical risk class
- B. CLINICAL DECISION-SUPPORT CALCULATOR
- Release status
- Under clinical review
- Source status
- Direct primary source identifier not yet resolved
- Clinical review status
- Under clinical verification
- Clinical review date
- Clinical review date not yet documented
DOI / PMID / direct guideline identifier not yet documented.
Assumptions
- Entered values and units are accurate and apply to the population described by the cited source.
- The published equation or rule is being used without a patient-specific clinical adjustment.
Important limitations
- The result does not replace clinical assessment or establish a diagnosis.
- Performance outside the source population may differ.