Magnesium repletion estimate
Banded IV magnesium sulfate repletion (Tong-Rude): mild 1-2 g, moderate 2-4 g, severe 4-8 g, keyed to the entered serum magnesium and severity band.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Serum magnesium
- 1.2 mg/dL
- Severity
- Moderate (~1.0-1.4 mg/dL)
Result: Moderate hypomagnesemia: 2-4 g magnesium sulfate IV.
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Serum magnesium
- Severity
How this is calculated
Tong GM, Rude RK. Magnesium deficiency in critical illness. J Intensive Care Med. 2005;20(1):3-17. Banded MgSO4 repletion: mild 1-2 g, moderate 2-4 g, severe 4-8 g IV; infuse per protocol. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.