health

Sodium Correction Calculator (Hyperglycemia)

Calculate corrected sodium in hyperglycemic patients. Glucose draws water from cells, diluting serum sodium and giving a falsely low value.

Reviewed by Chase FloiedUpdated April 16, 2026

This free online sodium correction calculator (hyperglycemia) provides instant results with no signup required. All calculations run directly in your browser — your data is never sent to a server. Enter your values below and see results update in real time as you type. Perfect for everyday calculations, homework, or professional use.

Measured Sodium (mEq/L)

Glucose (mg/dL)

How to Use This Calculator

Enter your input values

Fill in all required input fields for the Sodium Correction Calculator (Hyperglycemia). Most fields include unit selectors so you can work in your preferred unit system — metric or imperial, whichever matches your problem.

Review your inputs

Double-check that all values are correct and that you have selected the right units for each field. Incorrect units are the most common source of calculation errors and can produce results that are off by factors of 2, 10, or more.

Read the results

The Sodium Correction Calculator (Hyperglycemia) instantly computes the output and displays results with units clearly labeled. All calculations happen in your browser — no loading time and no data sent to a server.

Explore parameter sensitivity

Try adjusting individual input values to see how the output changes. This is a quick and effective way to develop intuition about how different parameters influence the result and to identify which inputs have the largest effect.

Formula Reference

Sodium Correction Calculator (Hyperglycemia) Formula

See calculator inputs for the governing equation

Variables: All variables and their units are labeled in the calculator interface above. Input fields accept values in multiple unit systems — select your preferred unit from the dropdown next to each field.

When to Use This Calculator

•Use the Sodium Correction Calculator (Hyperglycemia) for personal health tracking and wellness monitoring, establishing a baseline and tracking changes over time.
•Use it when recording fitness metrics to track progress toward health or athletic goals.
•Use it to compare measurements before and after a lifestyle, diet, or training change to quantify the impact.
•Use it as a conversation starter before a doctor's appointment, bringing objective data to discuss with a healthcare professional.

About This Calculator

The Sodium Correction Calculator (Hyperglycemia) is a free health and wellness calculation tool designed for personal use and general informational purposes. Calculate corrected sodium in hyperglycemic patients. Glucose draws water from cells, diluting serum sodium and giving a falsely low value. This calculator provides reference values based on established health screening formulas and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Results may vary based on individual factors not captured by the calculation. Consult a qualified healthcare provider for personalized health guidance. All calculations are performed locally in your browser — no personal health data is transmitted or stored.

About Sodium Correction Calculator (Hyperglycemia)

The Sodium Correction Calculator is an essential tool for emergency physicians and endocrinologists managing hyperglycemic patients. When blood sugar rises dramatically (as in diabetic ketoacidosis or hyperosmolar hyperglycemic state), glucose draws water out of cells into the bloodstream, diluting sodium and creating 'pseudo-hyponatremia' — a measured low sodium that doesn't actually represent true sodium depletion. Treating this artifactual hyponatremia as real could lead to dangerous over-correction of sodium. This calculator applies the Hillier correction factor (0.016 per mg/dL over 100) to reveal the true sodium concentration, guiding appropriate fluid and electrolyte management in critical hyperglycemic emergencies where rapid decisions save lives.

The Math Behind It

In hyperglycemic states, measured serum sodium appears falsely low (pseudo-hyponatremia) because glucose osmotically draws water from intracellular to extracellular space, diluting sodium concentration. **The Formula (Hillier 2004)**: Corrected Na⁺ = Measured Na⁺ + 0.016 × (Glucose - 100) - Sodium in mEq/L - Glucose in mg/dL **Why the Correction Is Needed**: 1. **Osmotic pull**: High glucose creates osmotic gradient 2. **Water shift**: Water moves from cells → extracellular fluid 3. **Dilution**: Sodium in larger extracellular volume = lower measured concentration 4. **Not true hyponatremia**: Total body sodium may be normal or high **Historical Correction Factors**: - **Katz (1973)**: 1.6 mEq/L per 100 mg/dL glucose over 100 (factor 0.016) - **Hillier (2004)**: Same 1.6 mEq/L factor — confirmed experimentally Older textbooks sometimes cite 2.88 mEq/L per 100 mg/dL — this is outdated and overcorrects. **Clinical Significance**: **When to use**: - Diabetic ketoacidosis (DKA) - Hyperosmolar hyperglycemic state (HHS) - Severe hyperglycemia (glucose >200 mg/dL) - Any hyperglycemic patient with low sodium **Why it matters**: Treating pseudo-hyponatremia with hypertonic saline could cause: - Rapid sodium rise → osmotic demyelination syndrome - Volume overload - Inappropriate management **Interpretation**: Example: Measured Na = 130, Glucose = 600 Corrected = 130 + 0.016 × (600 - 100) = 130 + 8 = **138 mEq/L** The patient actually has normal sodium! The hyponatremia was entirely due to glucose dilution. Proper management is to treat the hyperglycemia, not infuse saline to correct sodium. **Normal Sodium Range**: 135-145 mEq/L **Hyponatremia Severity**: - Mild: 130-134 - Moderate: 120-129 - Severe: <120 **Osmolality Calculation**: Serum Osmolality = 2(Na) + Glucose/18 + BUN/2.8 In hyperglycemia, osmolality can be markedly elevated even with 'low' sodium. **DKA Treatment Considerations**: 1. **Initial fluid resuscitation**: Normal saline regardless of corrected sodium 2. **After volume repletion**: Switch to 0.45% saline if corrected Na is normal or high 3. **Insulin therapy**: Decreases glucose, shifts water back into cells 4. **Potassium monitoring**: Essential as insulin drives K into cells 5. **Watch corrected Na trajectory**: Avoid rapid shifts

Formula Reference

Hillier Formula (2004)

Corrected Na = Measured Na + 0.016 × (Glucose - 100)

Variables: Na in mEq/L, Glucose in mg/dL

Worked Examples

Example 1: DKA Patient

30-year-old with DKA, glucose 600 mg/dL, measured Na 130 mEq/L.

Step 1:Corrected Na = 130 + 0.016 × (600 - 100)

Step 2:Corrected Na = 130 + 0.016 × 500

Step 3:Corrected Na = 130 + 8

Step 4:Corrected Na = 138 mEq/L

Corrected Na of 138 is within normal range. The apparent hyponatremia was pseudo-hyponatremia due to glucose. No sodium correction needed — focus on DKA management.

Example 2: HHS with True Hypernatremia

Elderly patient in HHS, glucose 1000 mg/dL, measured Na 150 mEq/L.

Step 1:Corrected Na = 150 + 0.016 × (1000 - 100)

Step 2:Corrected Na = 150 + 0.016 × 900

Step 3:Corrected Na = 150 + 14.4

Step 4:Corrected Na = 164.4 mEq/L

Corrected Na of 164 indicates severe hypernatremia on top of hyperglycemia. Significant free water deficit — extremely dangerous. Requires careful slow correction to avoid cerebral edema.

Common Mistakes & Tips

!Using the old 2.88 correction factor — overcorrects and can lead to inappropriate treatment.
!Treating pseudo-hyponatremia as true hyponatremia with hypertonic saline.
!Not recalculating corrected sodium as glucose decreases with treatment.
!Forgetting that very high glucose (>400) requires correction — below this, the correction is minimal.

Related Concepts

Anion Gap Calculator

Essential metric in DKA diagnosis.

Osmolality Calculator

Full osmolality assessment in hyperglycemia.

GFR Calculator

Kidney function also matters in DKA management.

Frequently Asked Questions

Why does glucose dilute sodium?

High serum glucose increases extracellular osmolality, drawing water from inside cells (lower osmolality) to outside cells (higher osmolality). This increases the volume of extracellular fluid, diluting the sodium in it. It's purely osmotic — there's no real sodium loss. The total sodium content of the body may be normal or even elevated, but it's distributed in more water.

When is the correction clinically significant?

Significant at glucose >200-300 mg/dL, and dramatic at >500 mg/dL. Below 200, the correction is only 1-2 mEq/L and usually doesn't change management. Above 500, the correction can be 10+ mEq/L and critically changes management decisions. Always correct in DKA (typical glucose 400-700) and HHS (typical glucose >800).

What's the difference between DKA and HHS?

Both are hyperglycemic emergencies but differ: DKA (diabetic ketoacidosis) — usually Type 1 diabetes, glucose 400-800, acidosis, ketones present, sudden onset. HHS (hyperosmolar hyperglycemic state) — usually Type 2 diabetes, glucose >800 (often >1000), minimal acidosis, severe dehydration, gradual onset over days. HHS mortality is higher (10-20%) versus DKA (<5%).

Should I still give IV fluids if corrected sodium is normal?

Yes, usually. Patients in DKA and HHS are typically severely dehydrated. Start with normal saline for volume resuscitation. After initial resuscitation (1-2 L), reassess and potentially switch to 0.45% saline if corrected sodium is normal or high. The goal is fluid replacement first, then electrolyte correction. Always follow current treatment protocols and hospital guidelines.