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Fractional Excretion of Mg

Renal vs extra-renal Mg loss

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1 What is the Fractional Excretion of Mg?

The Fractional Excretion of Mg is a paediatric bedside calculator in PediAid. Renal vs extra-renal Mg loss. Inputs compute live as they are typed, and the result is shown with the formula it came from and the source it is based on, so the number can be checked rather than trusted blindly.

2 When to use it

  • Calculating renal vs extra-renal Mg loss at the bedside
  • Checking a value before prescribing or escalating
  • Documenting the figure and the formula it came from

3 Formula & method

Enter the required values; the result updates as you type. The calculator screen states the formula used and the source it is taken from, and flags the interpretation band where one applies.
  • See the calculator screen in the app for its source.

4 Frequently asked questions

What does the Fractional Excretion of Mg calculate?

Renal vs extra-renal Mg loss.

Is the formula shown?

Yes. Every calculator in PediAid displays the formula and its source alongside the result.

Does it work offline?

Yes. The calculators are bundled with the app and need no connection.

Is this a substitute for clinical judgement?

No. It is a calculation aid; the treating clinician remains responsible for the decision.

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ESPGHAN 2022
For qualified clinicians. This page and the PediAid app are a clinical aid only. Calculations and reference data must be verified against the patient's clinical context, the source guideline and your local protocols before any treatment decision is made.