Template:FENa Calculator: Difference between revisions

Latest revision as of 16:51, 21 March 2026

Interactive FENa (Fractional Excretion of Sodium) calculator. Requires the calculator gadget.

Usage: {{FENa Calculator}}

Interpretation (in setting of oliguria/AKI)
<1%	Pre-renal azotemia — Kidneys are sodium-avid (hypoperfusion, hypovolemia, heart failure, cirrhosis). Consider volume resuscitation.
>2%	Intrinsic renal disease — ATN, AIN, or glomerulonephritis. Kidneys unable to concentrate urine.
1–2%	Indeterminate — May be seen in early ATN or with mixed etiologies. Clinical correlation required.
Important Caveats
FENa is unreliable on diuretics — use FEUrea instead Low FENa (<1%) can be seen in contrast nephropathy, rhabdomyolysis, early obstruction Not validated in CKD patients

References
Espinel CH. The FENa test: use in the differential diagnosis of acute renal failure. JAMA. 1976;236:579-581. PMID 947239. Steiner RW. Interpreting the fractional excretion of sodium. Am J Med. 1984;77:699-702. PMID 6486145.

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-! colspan="2" | Interpretation (in setting of oliguria/AKI)
+! colspan="2" | Interpretation (in setting of oliguria/[[Acute kidney injury|AKI]])
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 | style="background:#27ae60; color:white; text-align:center; width:20%; font-weight:bold;" | <1%
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 | style="background:#e74c3c; color:white; text-align:center; font-weight:bold;" | >2%
-| '''Intrinsic renal''' disease — ATN, AIN, or glomerulonephritis. Kidneys unable to concentrate urine.
+| '''Intrinsic renal''' disease — [[Acute tubular necrosis|ATN]], AIN, or glomerulonephritis. Kidneys unable to concentrate urine.
 |-
 | style="background:#f39c12; color:white; text-align:center; font-weight:bold;" | 1–2%