Sodium, Fractional Excretion


Sunquest Code:FENA  
Epic Code:LAB3469Epic Name:Fractional Excretion of Sodium
Order Instructions:Plasma Na and Creat must be ordered separately.
Synonyms:Fractional Excretion of Sodium; FENA
Methodology:Indirect potentiometric; biometric end point
CPT Code:84300, 82570
Test Includes:Urinary sodium and creatinine; blood sodium and creatinine must be collected within 6 hours (before or after).
Turnaround Time:Performed and reported 24 hours/day.
Associated Links:

Urine Collection Procedure



Collection Instructions

Specimen:Random urine specimen collected within 6 hours of blood specimen.
Optimal Volume:Submit entire urine collection (analysis requires 0.2 mL) in plastic leakproof container.
Container:Plastic leakproof container, sterile (Plastic leakproof container, sterile)


Processing and Shipping

Specimen Processing:Mix urine collection well before aliquot is taken; aliquot 1.25 mL, 0.2 mL minimum. Store in refrigerator.
Shipping Instructions:Ship at refrigerated temperature.
Test Performed at or Referral Lab Chemistry  (UMMC-East Bank, Fairview Lakes - FLMC, Fairview Ridges - FRH, Fairview Northland - FNMC, Fairview Southdale - FSH, UMMC/UMMCH-West Bank, M Health Clinic and Surgery Center)


Interpretive

Reference Range:

 

Suggests:

Prerenal Azotemia

Acute Tubular Necrosis

Neonates

less than 2.5%

greater than 2.5%

Adults

less than 1%

greater than 3%

 

 

Use:Evaluate suspected renal diseases that affect sodium clearance.


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