Electrolyte Correction
Under Construction
The Electrolyte Correction calculator is currently being developed. It will guide dosing for sodium, potassium, magnesium, and phosphate correction in adult patients.
Please check back soon or contact the Pharmacy Department for assistance.
🔒 Developer access
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🧂 Hyponatraemia Correction
WIP
📐 Formulas Used
TBW = TBW factor × Weight (kg)
Na⁺ Deficit (mmol) = TBW × (Target Na⁺ − Current Na⁺)
Vol NaCl 3% (mL) = (Na⁺ Deficit ÷ 513) × 1000
Vol NaCl 0.9% (mL) = (Na⁺ Deficit ÷ 154) × 1000
Est. correction time (hrs) = (Target − Current) ÷ 8 × 24
TBW factor: 0.6 (male), 0.5 (female) · NaCl 3% = 513 mmol/L · NaCl 0.9% = 154 mmol/L
Max correction rate assumed: 8 mmol/L/day (chronic hyponatraemia — risk of osmotic demyelination)
Max correction rate assumed: 8 mmol/L/day (chronic hyponatraemia — risk of osmotic demyelination)
🟡 Hypokalaemia Correction
WIP
📐 Formulas Used
K⁺ Deficit (mmol) = 0.4 × Weight (kg) × (Target K⁺ − Current K⁺)
Distribution factor: 0.4 (approximate K⁺ volume of distribution)
IV max rate: 10 mmol/hr (peripheral), 20 mmol/hr (central)
Oral: typical 40–80 mmol/day in divided doses — not calculated from deficit formula
IV max rate: 10 mmol/hr (peripheral), 20 mmol/hr (central)
Oral: typical 40–80 mmol/day in divided doses — not calculated from deficit formula
🔵 Hypomagnesaemia Correction
WIP
📐 Formulas Used
Severity classification based on serum Mg²⁺ level (mmol/L)
Severe: Mg²⁺ < 0.4 → 40 mmol MgSO₄ IV over 24 hrs
Moderate: 0.4–0.6 → 20 mmol MgSO₄ IV over 12 hrs
Mild: 0.6–0.74 → 10 mmol MgSO₄ IV over 6 hrs (or oral)
Dose not weight-based — severity-guided fixed dosing used here
Renal impairment (CrCl < 30): reduce dose by 50%, monitor closely
MgSO₄ 50% = 2 mmol/mL; MgSO₄ 49.3% ≈ 2 mmol/mL
Renal impairment (CrCl < 30): reduce dose by 50%, monitor closely
MgSO₄ 50% = 2 mmol/mL; MgSO₄ 49.3% ≈ 2 mmol/mL
🟠 Hypophosphataemia Correction
WIP
📐 Formulas Used
Severity classification based on serum PO₄³⁻ level (mmol/L)
Severe: PO₄³⁻ < 0.32 · Moderate: 0.32–0.65 · Mild: 0.65–0.8
IV Dose (mmol) = 0.08–0.16 mmol/kg × Weight
Oral Dose (mmol/day) = 0.5–1.0 mmol/kg × Weight
IV: infuse over 6 hrs; max rate ~7 mmol/hr
Oral: phosphate supplement (e.g. Phosphate-Sandoz) — divide into 2–3 daily doses
Severity thresholds and dose ranges based on general guidelines — verify against local protocol
Oral: phosphate supplement (e.g. Phosphate-Sandoz) — divide into 2–3 daily doses
Severity thresholds and dose ranges based on general guidelines — verify against local protocol