Estimates the sodium deficit needed to raise serum sodium to a target in a hyponatraemic child.
| Field | Unit | Notes |
|---|---|---|
| Weight | kg | 0.5–150 |
| Measured sodium | mEq/L | 100–135 |
| Target sodium | mEq/L | Commonly 135 (or 125 as an initial safe target) |
| Total body water fraction | — | Young infants run a higher TBW |
Estimates the sodium deficit needed to raise serum sodium to a target in a hyponatraemic child.
Weight (kg), Measured sodium (mEq/L), Target sodium (mEq/L), Total body water fraction.
Uses TBW = 0.6 × weight. A guide to total deficit only — it does not set the infusion rate, which must respect the daily correction limit.
Serum anion gap with optional albumin correction, delta gap and delta ratio.
Albumin-corrected serum calcium using the Payne correction (SI units).
Daily maintenance fluid requirement using the Holliday-Segar method.
Estimates safe sodium-correction rate and fluid replacement for a child with hyponatremia (Na < 135).
Estimates free-water deficit and fluid replacement for a child with hypernatremia (Na > 145).
Adjusts measured serum sodium for the dilutional effect of hyperglycaemia (e.g. in DKA).
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