Fractional Excretion of Sodium (FENa)

Synonyms

• FENA
• LAB14020

Cerner Name

FENa

Clinical Info

The Fractional excretion of sodium (FENa) and the Fractional excretion of Urea (FEUrea) tests require a serum and random urine specimen to both be collected within a short period of time from each other.

Specimen Sources

Urine, Clean Catch

Specimen Types

Urine

Specimen Volume

Container

Urine-Yellow Top

Collection Instructions

Container/Tube: Gold top tube AND Urine Container
Specimen: 1 mL serum and 1 mL Random Urine

Transport Instructions

Specimen Stability

Methodology

Calculation
The calculated values are:
FENa % = (Urine Sodium x Serum Creatinine) / (Serum Sodium x Urine Creatinine) x100.
FEUrea % = = (Urine Urea x Serum Creatinine) / (Serum Urea x Urine Creatinine) x100.

Days Performed

Performing Laboratories

Northwell Health Laboratories

CPT

PDM

231040

Results

Result Interpretation

Forms