General and clinical
Sodium correction for hyperglycemia
A high glucose pulls water into the vascular space and dilutes sodium, so the measured sodium understates the true value. This gives the sodium you would expect once the glucose is normal.
Enter the values
Hillier fits better at glucose above roughly 400 mg/dL.
The result appears as you type.
Nothing is sent anywhere. The calculation runs entirely in your browser.
This calculator is provided for reference and education. It does not replace clinical assessment, examination, current guidelines, local protocol, or professional judgment. Verify every result before acting on it. Nirogix accepts no liability for clinical decisions made using this tool.
The formula
- Katz: corrected Na = measured Na + 1.6 × (glucose − 100) ÷ 100
- Hillier: corrected Na = measured Na + 2.4 × (glucose − 100) ÷ 100
Worked example
Sodium 128 with glucose 600 mg/dL (Katz) → 128 + 1.6 × 5 = 136 mEq/L
When to use it
- Diabetic ketoacidosis and hyperosmolar hyperglycemic state
- Any hyponatremia with a markedly raised glucose
And when not to
- Correction rate matters more than the correction: over-rapid correction of chronic hyponatremia risks osmotic demyelination.
- Severe hypertriglyceridemia and paraproteinemia cause a different artefact this does not address.
References
- Hyperglycemia-induced hyponatremia — Katz MA, New England Journal of Medicine, 1973
- Hyponatremia: evaluating the correction factor for hyperglycemia — Hillier TA et al., American Journal of Medicine, 1999
Last reviewed 07/09/2026.
More general and clinical calculators
BMI calculator
Body mass index is weight divided by height squared, and it places a person in a weight band. This calculator shows both the WHO international bands and the lower Asian-Indian cut-offs, because they disagree and the Indian ones are the relevant pair here.
Body surface area (BSA)
Body surface area estimates the area of a person’s skin from height and weight. It is the basis for chemotherapy dosing, some pediatric dosing, and cardiac index.
Mean arterial pressure (MAP)
Mean arterial pressure is the average pressure driving blood into the tissues over one cardiac cycle. It is the number resuscitation targets are written against, rather than the systolic.
Glasgow Coma Scale (GCS)
The Glasgow Coma Scale scores eye, verbal and motor responses to describe a person’s level of consciousness in one number between 3 and 15. It is recorded as three components, not just a total.
Anion gap
The anion gap is the difference between measured cations and measured anions, and it separates the causes of a metabolic acidosis into two groups. Correcting it for albumin matters, because a low albumin hides a raised gap.
Corrected calcium
About half of serum calcium is bound to albumin, so a low albumin makes total calcium look low when the free, active fraction is normal. This adjusts the measured value for the albumin.
These calculators are free and always will be. We also build Nirogix, a hospital management system for Indian clinics and hospitals. The same calculations are planned inside the consultation record, pre-filled from the chart.