What is corrected sodium?
Corrected sodium is the estimated true serum sodium after adjusting for hyperglycemia (dilutional / translocation effect). This sodium correction calculator keeps it simple: enter Na and glucose, then read Corrected Na using the standard Katz and Hillier corrected sodium formula approaches — the same two inputs used on MDCalc and EBMConsult-style tools.
Measured Na vs corrected Na
Hyperglycemia pulls water into the extracellular space and dilutes measured sodium.
Corrected sodium normal range
Use corrected sodium — not measured sodium — when glucose is high.
Corrected sodium formula
For corrected sodium for hyperglycemia, the sodium correction formula hyperglycemia uses glucose in mg/dL. This free corrected sodium calculator shows both classic factors side by side.
The katz formula corrected sodium adds 1.6 mEq/L for every 100 mg/dL glucose above 100. It is the traditional bedside factor.
The hillier formula corrected sodium uses 2.4 mEq/L per 100 mg/dL above 100 and is often favored in severe hyperglycemia.
Corrected sodium calculation example
Worked corrected sodium calculation example for a corrected sodium calculator mmol/L result (Na in mEq/L = mmol/L):
Example · Na 132 · Glucose 500 mg/dL
- Measured sodium = 132
- Glucose excess = 500 − 100 = 400 mg/dL
- Katz: 132 + 0.016 × 400 = 138.4 mEq/L
- Hillier: 132 + 0.024 × 400 = 141.6 mEq/L
Takeaway: measured Na looked low; corrected Na sits near or inside the normal band.
How to calculate corrected sodium
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1
Enter sodium
Use measured serum Na. Units are mEq/L or mmol/L (same numeric value for sodium).
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2
Enter glucose
Use the corrected sodium calculator mg/dL mode, or enter mmol/L and let the tool convert (×18).
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3
Read both results
Compare Katz and Hillier corrected Na against the corrected sodium normal range (~135–145).
Sodium correction rate calculator
A sodium correction rate calculator view is simply the factor you apply: Katz 1.6 or Hillier 2.4 mEq/L sodium increase for each 100 mg/dL glucose above 100. Higher glucose → larger correction delta.
Correction delta rises with glucose
When to use corrected sodium
When to use corrected sodium: measured hyponatremia with elevated glucose — especially sodium correction dka and sodium correction hhs. In these settings, corrected sodium vs measured sodium can flip the story from “true low Na” to “dilution from hyperglycemia.”
Corrected sodium & low protein states
This page’s calculator is the bedside sodium correction calculator for glucose (Na + glucose only). Separately, labs that use indirect ISE can show artifactual sodium shifts with abnormal proteins. Search intent for the corrected sodium formula in hypoalbuminemia usually means recognizing pseudohyponatremia (or the reverse bias with low protein) — not changing the hyperglycemia formula itself.
Pseudohyponatremia pattern
A pseudohyponatremia calculator pattern: measured Na low → corrected Na normal after glucose fix.
Protein note (education)
Common lab teaching formula using total protein (g/L):
Prefer direct ISE / blood-gas sodium when protein or lipid artifact is suspected. Confirm with measured serum osmolality.
Clinical pearl. Treat the corrected sodium calculator result as decision support. Pair it with volume status, glucose trend, potassium plan, and repeat labs — especially in DKA/HHS.
Related clinical calculators
Continue the electrolyte workup with the anion gap calculator, osmolar gap calculator, free water deficit calculator, corrected calcium calculator, FeNa calculator, and eGFR calculator.
FAQ · corrected sodium calculator
What is corrected sodium?
Corrected sodium is the estimated serum sodium after adjusting measured Na for hyperglycemia with the Katz or Hillier corrected sodium formula.
How to calculate corrected sodium?
Enter Na and glucose. Katz: Na + 0.016 × (Glucose − 100). Hillier: Na + 0.024 × (Glucose − 100). Glucose must be in mg/dL (or converted from mmol/L).
What is the sodium correction formula for hyperglycemia?
The sodium correction formula hyperglycemia uses 1.6 (Katz) or 2.4 (Hillier) mEq/L sodium increase per 100 mg/dL glucose above 100.
What is the katz formula corrected sodium?
Katz formula corrected sodium = Measured Na + 0.016 × (Glucose mg/dL − 100). Classic factor of 1.6 per 100 mg/dL.
What is the hillier formula corrected sodium?
Hillier formula corrected sodium = Measured Na + 0.024 × (Glucose mg/dL − 100). Often preferred when glucose is very high.
What is the corrected sodium normal range?
About 135–145 mEq/L. Always interpret corrected sodium vs measured sodium when hyperglycemia is present.
When to use corrected sodium?
Use it for measured hyponatremia with high glucose — including sodium correction DKA and sodium correction HHS assessments.
How do mmol/L and mg/dL work in a corrected sodium calculator?
Corrected sodium calculator mmol/L output uses mEq/L for Na (equivalent). Glucose may be entered as mg/dL or mmol/L; formulas convert glucose to mg/dL.
What about the corrected sodium formula in hypoalbuminemia?
This calculator corrects for glucose only. Separately, protein/lipid artifacts can bias indirect ISE sodium. Direct ISE and osmolality help confirm true vs artifactual values.
What does a pseudohyponatremia calculator pattern mean?
Measured Na low but corrected Na normal after glucose correction supports dilution/translocation rather than true hypotonic hyponatremia alone. Confirm with serum osmolality.
