Fluids and electrolytes
Sodium Correction Rate (Hyponatraemia)
Safe rate of sodium correction to avoid osmotic demyelination.
Sodium Correction Rate (Hyponatraemia) calculator
Result
2 mmol/L/h
Max 12 mmol/L per 24h (acute < 48h)
Na deficit to 135: 17 mmol/L. Stop at 125 mmol/L if sodium rising faster than target.
How to use it
- 1
Is hyponatraemia acute (< 48h) or chronic (≥ 48h)?. Acute: faster correction (2 mmol/L/h) safe. Chronic: max 0.5 mmol/L/h or 10 mmol/L/24h.
- 2
Seizures or coma. 3% saline bolus 2 mL/kg over 20 min — raise Na by ~5 mmol/L to terminate seizure.
- 3
Overcorrection danger. If Na rises > 10 mmol/L/24h: give dextrose 5% + desmopressin to re-lower Na slowly (ODS risk).
When to use it
- Symptomatic hyponatraemia
- Seizures, vomiting, GCS decrease: rapid initial correction (3% NaCl) then slow down.
- SIADH management
- Fluid restrict + urea or vaptans. Correct max 6 mmol/L/24h (ESPEN recommendation for chronic SIADH).
- Marathon/beer potomania/psychogenic polydipsia
- Acute dilutional: Na may correct rapidly with water restriction alone — monitor every 2h.
A reference for clinicians and students, not medical advice. A score supports a decision; it does not make one. Check every result against the patient in front of you and your local protocol.
At a glance
- Specialty
- Fluids and electrolytes
- Inputs
- 2
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