🧂 Electrolyte Replacement Reference
Repletion doses, routes and rate ceilings for potassium, magnesium, calcium and phosphate. Browser-side reference.
IV potassium too fast/concentrated risks arrhythmia — respect the ceiling.
Paste the link in Slack, Teams, X, or LinkedIn — the preview image comes from this page’s Open Graph card.
When to use
Bedside reminder of how much, by what route and how fast to replete each electrolyte. Sodium and free-water deficits are in the dedicated electrolyte tools.
How it works
K: oral 20–40 mmol, IV peripheral ≤ 10 mmol/h. Mg: MgSO4 1–2 g IV. Ca: gluconate 1–2 g IV slow. Phos: 0.08–0.16 mmol/kg over 2–6 h.
Key points
- IV potassium too fast/concentrated risks arrhythmia — respect the ceiling.
- Replace magnesium first; it underlies refractory hypokalaemia/hypocalcaemia.
- Calcium gluconate is preferred over chloride peripherally.
- Watch calcium-phosphate precipitation when co-infusing.
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.
| Electrolyte | Hypokalaemia |
|---|
→Repletion pointsPotassium repletion
- Oral：KCl 20–40 mmol, up to 100 mmol/day (mild-moderate, K 2.5–3.2)
- IV：Peripheral ≤ 10 mmol/h (concentration ≤ 30–40 mmol/L); central line + monitoring ≤ 20 mmol/h
- Key：Replace magnesium concurrently (otherwise hard to correct); deficits often take days; monitor ECG and potassium
| Electrolyte | Hypophosphataemia |
|---|
→Repletion pointsPhosphate repletion
- Oral：Mild-moderate (1.0–2.4 mg/dL): oral phosphate salts
- IV：Severe (< 1.0) / symptomatic: sodium or potassium phosphate 0.08–0.16 mmol/kg over 2–6 h
- Monitoring：Calcium, renal function; risk of calcium-phosphate precipitation if co-infused with calcium
Frequently asked questions
- What is Electrolyte Replacement Reference?
- Repletion doses, routes and rate ceilings for potassium, magnesium, calcium and phosphate. Browser-side reference.
- How is Electrolyte Replacement Reference calculated? What is the core formula?
- K: oral 20–40 mmol, IV peripheral ≤ 10 mmol/h. Mg: MgSO4 1–2 g IV. Ca: gluconate 1–2 g IV slow. Phos: 0.08–0.16 mmol/kg over 2–6 h.
- When is Electrolyte Replacement Reference used?
- Bedside reminder of how much, by what route and how fast to replete each electrolyte. Sodium and free-water deficits are in the dedicated electrolyte tools.
- What are the key clinical points for Electrolyte Replacement Reference?
- IV potassium too fast/concentrated risks arrhythmia — respect the ceiling. Replace magnesium first; it underlies refractory hypokalaemia/hypocalcaemia. Calcium gluconate is preferred over chloride peripherally. Watch calcium-phosphate precipitation when co-infusing.
- What are the limits and cautions when using Electrolyte Replacement Reference?
- 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.
- How is Electrolyte Replacement Reference calculated in practice? Can you show a worked example?
- Inputs: Electrolyte Hypokalaemia → Result: Repletion points Potassium repletion（Oral: KCl 20–40 mmol, up to 100 mmol/day (mild-moderate, K 2.5–3.2), IV: Peripheral ≤ 10 mmol/h (concentration ≤ 30–40 mmol/L); central line + monitoring ≤ 20 mmol/h, Key: Replace magnesium concurrently (otherwise hard to correct); deficits often take days; monitor ECG and potassium） Inputs: Electrolyte Hypophosphataemia → Result: Repletion points Phosphate repletion（Oral: Mild-moderate (1.0–2.4 mg/dL): oral phosphate salts, IV: Severe (< 1.0) / symptomatic: sodium or potassium phosphate 0.08–0.16 mmol/kg over 2–6 h, Monitoring: Calcium, renal function; risk of calcium-phosphate precipitation if co-infused with calcium）