Fractional Excretion of Sodium

Message

It is recommended that urine assays be performed within 2 hours of collection. No preservative is required

Test Code

LAB4057

CPT Codes
82565

Minimum Volume

1 ml Lithium heparin plasma and 1 ml random urine

Specimen Stability

Refer to individual components (Sodium and Creatinine)

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Refer to individual components (Sodium and Creatinine)

Methodology
Jaffe rate method and Ion-Selective Electrode Indirect

Setup Schedule

Mon-Sun

Reference Range

Below 1%: Prerenal disease; Above 2% or 3%: Acute tubular Necrosis or other kidney damage; Intermediate: Either disorder.

Clinical Significance

Fractional excretion of sodium (FENa) is the percentage of salt (sodium) filtered by the kidney which is excreted in
the urine. FENa is a calculation based on the concentrations of sodium and creatinine in blood and urine.

Performing Laboratory
Piedmont Athens Regional

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.