Corrected Sodium Calculator
Hyperglycemia dilution correction sketch for measured sodium. Click any i for detail.
Labs
Measured sodium (mEq/L)
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Na
Serum sodium from the lab. |
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|---|---|
Glucose (mg/dL)
i
Glucose
Serum glucose paired with that sodium. |
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Correction factor
i
Factor
Common teaching factors: 1.6 (Katz) or 2.4 (Hillier). Default 1.6. |
How to use this calculator
- Enter measured Na and glucose.
- Pick a correction factor your reference uses.
- Read corrected Na.
- Defer treatment decisions to the care team.
Results explained
High glucose draws water into the extracellular space and can dilute measured sodium. A common correction adds a factor × ((glucose − 100)/100) to measured Na. Published factors vary (about 1.6 to 2.4). This is a teaching worksheet, not an order set.
Quick reference: corrected Na
Corrected Na ≈ measured Na + factor × ((glucose − 100) / 100).
| Item | Detail |
|---|---|
| Factor 1.6 | Classic Katz-style teaching value |
| Factor 2.4 | Hillier-style alternative |
| Glucose 100 | No correction term |
| Units | Glucose in mg/dL for this form |
Educational only — hyperglycemia care is clinical.
How the estimate is built
Na_corr = Na_meas + factor × ((glucose − 100) / 100).
Example scenario
Na 130, glucose 300, factor 1.6 → 130 + 1.6×2 = 133.2 mEq/L.
FAQ
Which factor should I use?
Follow the reference your course or hospital uses; both 1.6 and 2.4 appear in literature.
What about SI glucose (mmol/L)?
Convert to mg/dL (×18) before using this form, or rescale the formula.
Does this fix pseudohyponatremia from lipids/protein?
No — that is a different lab artifact pathway.
Is corrected Na what the lab reports?
Usually the lab reports measured Na; correction is an interpretation step.