“Spot urine sodium and FeNa+
1. Since hypovolemia promotes avid sodium reabsorption, hypovolemia is usually associated with a low urinary sodium concentration (< 20–30 mEq/L) and low FeNa+(< 0.5%). On the other hand, euvolemic patients do not have a stimulus to reabsorb urine sodium and usually have a higher urinary sodium (> 20–30 mEq/L) and FeNa+.”
Stern SDC, Cifu AS, Altkorn D. Symptom to Diagnosis: An Evidence-Based Guide. 3rd edition. New York, NY: McGraw-Hill Medical; 2015. Available here.
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