Calculate Fractional Excretion of Multiple Electrolytes

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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 ]

Serum Creatinine (mg/dL) :
Serum Sodium (mmol/L) :
Serum Chloride (mmol/L) :
Serum Urea (mg/dL) :
Serum Uric acid (mg/dL) :
Serum Calcium (mg/dL) :
Serum Phoshorus (mg/dL) :
Serum Magnesium (mg/dL) :

[ Urine chemistry ]

Urine Creatinine (mg/dL) :
Urine Sodium (mmol/L) :
Urine Chloride (mmol/L) :
Urine Urea (mg/dL) :
Urine Uric acid (mg/dL) :
Urine Calcium (mg/dL) :
Urine Phoshorus (mg/dL) :
Urine Magnesium (mg/dL) :

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

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