Electrolytes · Hyperglycemia

Corrected Sodium Calculator

Estimate serum sodium after accounting for glucose-related water shift. Both commonly used coefficients are shown.

Inputs

Calculated locally. No values are stored.

Private
mmol/L
mg/dL

Your result will appear here

Enter the required values and calculate.

Why two results?

Katz described a 1.6 mmol/L correction per 100 mg/dL glucose above 100. Hillier and colleagues found 2.4 mmol/L was a better overall estimate in their experiment and noted nonlinearity above 400 mg/dL. Corrected sodium is an estimate, not a treatment target.

Sources: Katz, NEJM 1973, PMID 4763428 · Hillier et al., Am J Med 1999, PMID 10225241.