About this calculator
Hyperglycemia can lower measured serum sodium by shifting water into the extracellular space. Corrected sodium estimates what sodium may be after accounting for glucose elevation.
Corrected Na = measured Na + correction factor × ((glucose − 100) / 100). Common factors include 1.6 or 2.4 mEq/L per 100 mg/dL glucose above 100.
Source-mapped educational formula
Educational estimate only; not a diagnosis, prescription, or treatment plan.
Formula and method
Corrected Na = measured Na + factor × ((glucose − 100) / 100), applied when glucose is above 100 mg/dL.
Limitations and when not to rely on this result
- Educational estimate only; not a diagnosis, prescription, or treatment plan.
- Result depends on accurate inputs and may not apply to complex medical situations.
- Use clinician judgment, local guidance, and urgent care pathways when symptoms are severe.
Frequently asked questions
What correction factor should I use? +
The classic factor is 1.6 mEq/L per 100 mg/dL glucose above 100. Some evidence supports 2.4, especially in marked hyperglycemia.
Does corrected sodium replace measured sodium? +
No. It is an estimate used with the measured sodium, glucose, osmolality, volume status, and clinical context.
Can this manage DKA or HHS? +
No. Diabetic ketoacidosis and hyperosmolar hyperglycemic state require urgent protocol-based care.
What if glucose is below 100 mg/dL? +
This calculator adds no hyperglycemia correction when glucose is 100 mg/dL or lower.
Can I use mmol/L glucose? +
This version expects glucose in mg/dL. Convert mmol/L glucose to mg/dL by multiplying by 18.