Corrected sodium calculator
Correct a sodium result for a high glucose. When blood sugar is high it dilutes sodium, making it read falsely low — this estimates the true sodium using the Katz and Hillier formulas. Sodium in mmol/L (= mEq/L); glucose in mg/dL or mmol/L.
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Educational reference only — not medical advice. The correction estimates sodium at a normal glucose; a genuinely low or high corrected sodium belongs in a conversation with a clinician, read with your glucose and clinical picture. Reference ranges vary by lab.
## What corrected sodium numbers mean
| Corrected sodium | Category |
| --- | --- |
| < 135 mmol/L | Low (hyponatraemia) |
| 135–145 mmol/L | Normal |
| > 145 mmol/L | High (hypernatraemia) |
If a low measured sodium **corrects back into 135–145**, the low reading was largely a dilution effect from high glucose. If it's **still low after correcting**, that points to genuine hyponatraemia. Ranges vary by lab, so read against your own report.
## The formulas
For every 100 mg/dL that glucose sits above 100, sodium is nudged up:
- **Katz (1973):** corrected Na = measured Na + **1.6** × (glucose − 100) ÷ 100
- **Hillier (1999):** corrected Na = measured Na + **2.4** × (glucose − 100) ÷ 100
Katz is the traditional factor; Hillier's larger factor fits better at very high glucose (above roughly 400 mg/dL / 22 mmol/L). In SI units, glucose (mmol/L) is converted to mg/dL (× 18) before applying the formula. If glucose is normal, both corrections are essentially zero.
## The rest of your metabolic panel
Sodium and glucose sit on the same metabolic panel — read each on its own too:
- **Sodium** — see [what your sodium level means](/blog/what-your-sodium-level-means/).
- **Glucose** — see [what your fasting glucose means](/blog/what-your-fasting-glucose-means/).
- **Electrolytes & acid–base** — try the [anion gap calculator](/tools/anion-gap-calculator/) and the [corrected calcium calculator](/tools/corrected-calcium-calculator/).
- Working in different units? The [mmol/L ↔ mg/dL converter](/tools/mmol-mg-dl-converter/) switches glucose between systems.
## Track your labs over time — privately
A single sodium is a snapshot; the value is in the **trend**. [Quanome](/) pulls your labs, Apple Health, and even your DNA into one private timeline on your device — parsed locally, never uploaded — with an AI coach that reads your metabolic panel in whichever units you use.
Track your labs over time, privately
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