Sodium, Fractional Excretion
| Abbrev Code: | FENA | ||
| Order Code: | LAB3469 | Order Name: | Fractional Excretion of Sodium |
| Order Instructions: | Plasma Na and Creat must be ordered separately. | ||
| Synonyms: | Fractional Excretion of Sodium; FENA | ||
| Methodology: | Calculation of FENA based on urine and blood sodium and creatinine. | ||
| CPT Codes: | 84300 x1, 84300 x1, 82570 x1, 82570 x1 | ||
| 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: | |||
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 |
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. |
| Stability: | Roche: 2 days at room temperature; 6 days refrigerated; 6 months frozen. |
| Test Performed at or Referral Lab | Chemistry (Roche-Grand Itasca, Roche-Lakes, Roche-Northland, Roche-Ridges, Roche-Southdale, Roche-St. John's, Roche-UMMC East, Roche-UMMC West) |
Interpretive
| Reference Range: |
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| Use: | Evaluate suspected renal diseases that affect sodium clearance. |
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