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Calculate Fractional Excretion of Multiple Electrolytes
Quickly calculate fractional excretion (FE) of various electrolytes.
Serum Creatinine and Urine Creatinine are required.
Enter any electrolyte values (serum/urine) to calculate its FE.
[ Blood chemistry ]
[ Urine chemistry ]
Electrolyte | Primary Tubule Location | Meaning of Fractional Excretion (FE) |
---|---|---|
Sodium (Na⁺) | Entire tubule (especially proximal tubule, distal tubule, collecting duct) | Reflects overall tubular sodium reabsorption ability |
Potassium (K⁺) | Distal tubule, collecting duct (secretion) | Assesses aldosterone function and potassium secretion |
Calcium (Ca²⁺) | Proximal tubule, thick ascending limb (TAL), distal tubule | Evaluates PTH function and calcium excretion |
Magnesium (Mg²⁺) | Thick ascending limb (TAL) | Helps differentiate magnesium wasting |
Phosphate (PO₄³⁻) | Proximal tubule | Reflects effects of PTH and FGF23 on phosphate handling |
Uric Acid (UA) | Proximal tubule | Used to distinguish SIADH, AKI, and tubular function |