Fractional excretion of magnesium (FEMg)
Fractional excretion of magnesium (FEMg) - a deterministic tool in Sophie Well's Clinical Math & Conversions group.
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What this is
Fractional excretion of magnesium (FEMg) is one of 230 deterministic tools in Sophie Well's Clinical Math & Conversions group. Fractional excretion of magnesium (FEMg) - a deterministic tool in Sophie Well's Clinical Math & Conversions group.
When to use it
Use this tool when you need a quick, citable reference. Every calculation runs entirely in your browser - no inputs leave your device, no account is required, no AI is involved. The site enforces a strict Content Security Policy and ships no analytics or third-party CDN.
References
Elisaf M, Panteli K, Theodorou J, Siamopoulos KC. Fractional excretion of magnesium in normal subjects and in patients with hypomagnesemia. Miner Electrolyte Metab. 1998;24(2-3):315-318. Read the source ↗
Worked example: FEMg 4.8%: above ~2% (Elisaf hypomagnesemia cutoff ~4%), consistent with renal magnesium wasting.
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