Corrected Sodium Calculator Form
Example Data Table
| Case | Measured Sodium | Glucose | Factor | Corrected Sodium | Comment |
|---|---|---|---|---|---|
| 1 | 128 mEq/L | 300 mg/dL | 1.6 | 131.2 mEq/L | Mild upward correction with moderate hyperglycemia. |
| 2 | 130 mEq/L | 400 mg/dL | 1.6 | 134.8 mEq/L | Approaches normal range after correction. |
| 3 | 132 mEq/L | 600 mg/dL | 2.4 | 144.0 mEq/L | Larger factor materially changes interpretation. |
Formula Used
Corrected Sodium = Measured Sodium + ((Glucose - Baseline Glucose) / 100) × Correction Factor
This calculator lets you choose the correction factor because clinicians often compare 1.6 and 2.4 mEq/L for every 100 mg/dL glucose above the selected baseline. Glucose entered in mmol/L is converted internally to mg/dL before correction.
Effective Osmolality = 2 × Measured Sodium + Glucose / 18
Free Water Deficit = Total Body Water × ((Corrected Sodium / 140) - 1)
Clinical context matters. Volume status, measured osmolality, ketones, renal function, and treatment timing may change interpretation.
How to Use This Calculator
- Enter the measured serum sodium result.
- Enter serum glucose and choose its unit.
- Keep the baseline glucose at 100 mg/dL unless your protocol differs.
- Select the correction factor your team prefers.
- Add weight, sex, age, and body water adjustment for extra estimates.
- Press the calculate button to display the result above the form.
- Review interpretation notes, then export the report as CSV or PDF.
Frequently Asked Questions
1. Why does sodium look low during hyperglycemia?
High glucose pulls water into the extracellular space. That water shift dilutes measured sodium, so the lab value may look lower than the underlying sodium concentration.
2. Why can I choose 1.6 or 2.4?
Both correction factors appear in clinical teaching and published discussions. Some teams use 1.6 routinely, while others compare it with 2.4 when glucose elevation is marked.
3. Does corrected sodium diagnose the patient?
No. It is a support value only. Final decisions still depend on symptoms, volume status, acid-base findings, osmolality, kidney function, and the broader treatment picture.
4. Can I use mmol/L for glucose?
Yes. The calculator accepts mmol/L or mg/dL. If you choose mmol/L, it converts the glucose value internally before applying the sodium correction formula.
5. What is the baseline glucose field for?
It sets the glucose level above which correction starts. Many examples use 100 mg/dL, but the field stays editable to match local practice or study methods.
6. Why include total body water and free water deficit?
These extra estimates help frame fluid discussions when corrected sodium is high. They are rough planning values, not direct fluid orders or treatment instructions.
7. When should I be cautious with the result?
Use caution during severe hyperglycemia, diabetic ketoacidosis, hyperosmolar states, mixed electrolyte disorders, major fluid shifts, or when laboratory timing and sampling are uncertain.
8. Does the result section print well?
Yes. The page uses a clean white layout, and the export buttons generate a simple CSV file or a PDF snapshot of the result area.