🧂 Phosphate Deficit Estimate
UseWhen to use: hypophosphatemia planning adjunct when a goal level is chosen.
StrataTrue deficit often exceeds the extracellular estimate — recheck levels during repletion.
LimitsWhen not to use: severe renal failure without dose adjustment. · Pitfall: ignoring Ca/K shifts. · Not a bolus protocol.
SourceTeaching phosphate deficit estimate
This-shift next steps
After scoring: open the scene pack, peer scores, and the matching pathway. Local reference — no HIS write.
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Methodology · worked example, guidelines & full notes
ΔPO₄ × factor × wt.
When to use
When to use: hypophosphatemia planning adjunct when a goal level is chosen.
How it works
Deficit ≈ (goal − now) × factor × weight.
Key points
- ΔPO₄ × factor × wt.
- Teaching estimate.
- Next: cause / refeeding risk.
References
- Teaching phosphate deficit estimate
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.
| Phosphate units | mg/dL |
|---|---|
| Current phosphate | 1.5 mg/dL or mmol/L |
| Goal phosphate | 3.0 mg/dL or mmol/L |
| Weight | 70 kg |
| Distribution factor | 0.2 L/kg |
→Estimated PO₄ deficit210mg
- ΔPO₄：1.50 mg/dL
- ≈ mmol：6.8 mmol
| Phosphate units | mmol/L |
|---|---|
| Current phosphate | 1.5 mg/dL or mmol/L |
| Goal phosphate | 3.0 mg/dL or mmol/L |
| Weight | 70 kg |
| Distribution factor | 0.2 L/kg |
→Estimated PO₄ deficit21.0mmol
- ΔPO₄：1.50 mmol/L
- ≈ mg elemental P：651 mg
Verification & sources · governance
FAQ
Frequently asked questions
- Does Phosphate Deficit Estimate upload patient data? Where is it calculated?
- Calculation runs locally in the browser; inputs and results are not uploaded. For licensed clinicians only; interpret with history, investigations and local protocols — not a diagnosis or prescription.
- How is Phosphate Deficit Estimate calculated in practice? Can you show a worked example?
- Inputs: Phosphate units mg/dL, Current phosphate 1.5 mg/dL or mmol/L, Goal phosphate 3.0 mg/dL or mmol/L, Weight 70 kg, Distribution factor 0.2 L/kg → Result: Estimated PO₄ deficit 210 mg（ΔPO₄: 1.50 mg/dL, ≈ mmol: 6.8 mmol） Inputs: Phosphate units mmol/L, Current phosphate 1.5 mg/dL or mmol/L, Goal phosphate 3.0 mg/dL or mmol/L, Weight 70 kg, Distribution factor 0.2 L/kg → Result: Estimated PO₄ deficit 21.0 mmol（ΔPO₄: 1.50 mmol/L, ≈ mg elemental P: 651 mg）