ToolsCalculators
Sodium Deficit in Hyponatremia
Total sodium needed to reach a target serum concentration.
Sodium Deficit in Hyponatremia
Body weight
Total body water fraction
Current serum sodium
mEq/L
Target serum sodium
mEq/L
Complete the fields above to see the result.
When to use
- Estimating the total amount of sodium to replace when correcting hyponatremia.
Formula
Sodium deficit (mEq) = total body water x (target Na - serum Na); total body water = weight x fraction.
Pearls and pitfalls
- This gives total sodium to replace, not the rate; cap the daily rise to avoid osmotic demyelination.