Fractional Excretion of Magnesium Calculator
FEMg: differentiates renal vs extrarenal magnesium wasting
When to use it
Use to differentiate renal magnesium wasting from extrarenal causes of hypomagnesemia.
Category
Acute Kidney Injury (AKI) Workup
References
- Elisaf M et al. Fractional excretion of magnesium in normal subjects and in patients with hypomagnesemia. Magnes Res. 1997;10:315-20. PMID: 9513927
- Agus ZS. Hypomagnesemia. J Am Soc Nephrol. 1999;10:1616-22. PMID: 10405219
About NephroMind
This calculator is part of NephroMind, a free clinical decision-aid platform from the Arab Society of Nephrology and Renal Transplantation (ASNRT) — over 128 bedside nephrology calculators plus a renal drug-dosing database, coded by a practicing transplant nephrologist.