🧪 Sodium Deficit (Hyponatraemia)
UseQuantify sodium needed to reach a target in hyponatraemia.
SourceAdrogué HJ, Madias NE. N Engl J Med 2000
This-shift next steps
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Methodology · worked example, guidelines & full notes
A formula difference, not an infusion plan.
When to use
Quantify sodium needed to reach a target in hyponatraemia.
How it works
Na deficit = TBW × (target Na − current Na), TBW = factor × weight (0.6 male, 0.5 female/elderly).
Key points
- A formula difference, not an infusion plan.
- Ongoing losses and fluid type also change sodium.
- Correction-rate recommendations vary; follow local protocol.
References
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Weight | 70 kg |
|---|---|
| Current sodium | 120 mmol/L |
| Target sodium | 130 mmol/L |
| Total body water factor | Adult female / elderly male (0.5) |
→Sodium deficit350mmol
- Total body water：35.0 L
- Formula：TBW × (target Na − current Na)
| Weight | 70 kg |
|---|---|
| Current sodium | 120 mmol/L |
| Target sodium | 130 mmol/L |
| Total body water factor | Adult male (0.6) |
→Sodium deficit420mmol
- Total body water：42.0 L
- Formula：TBW × (target Na − current Na)
Verification & sources · governance
FAQ
Frequently asked questions
- What are the limits and cautions when using Sodium Deficit (Hyponatraemia)?
- For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
- Does Sodium Deficit (Hyponatraemia) upload patient data? Where is it calculated?
- Calculation runs locally in the browser; inputs and results are not uploaded. For licensed clinicians only; interpret with history, investigations and local protocols — not a diagnosis or prescription.
- How is Sodium Deficit (Hyponatraemia) calculated in practice? Can you show a worked example?
- Inputs: Weight 70 kg, Current sodium 120 mmol/L, Target sodium 130 mmol/L, Total body water factor Adult female / elderly male (0.5) → Result: Sodium deficit 350 mmol（Total body water: 35.0 L, Formula: TBW × (target Na − current Na)） Inputs: Weight 70 kg, Current sodium 120 mmol/L, Target sodium 130 mmol/L, Total body water factor Adult male (0.6) → Result: Sodium deficit 420 mmol（Total body water: 42.0 L, Formula: TBW × (target Na − current Na)）