Corrected Sodium for Hyperglycemia
Calculates the corrected serum sodium accounting for dilutional effect of severe hyperglycemia.
mEq/L
Measured serum sodium concentration
mg/dL
Serum glucose in mg/dL
Katz uses 1.6 mEq/L per 100 mg/dL; Hillier uses 2.4 mEq/L per 100 mg/dL
Enter sodium and glucose to calculate corrected sodium
References
- Sodium Correction in Hyperglycemia (Katz 1973) - Merck Manual
- Sodium Correction for Hyperglycemia - MDCalc - MDCalc Journal
Clinical Notes & Warnings
- Act on corrected sodium level, not measured sodium.
- Katz formula (1.6 mEq/L per 100 mg/dL) is most widely used but may underestimate in severe hyperglycemia.
- Hillier formula (2.4 mEq/L per 100 mg/dL) may be more accurate in severe hyperglycemia (>400 mg/dL).
- Correction factor may vary by population (ICU patients, diabetes status).
- Glucose must be in mg/dL.
Hyperglycemia causes osmotic shift of water into extracellular space, diluting sodium. Formulas estimate sodium if glucose were normalized to 100 mg/dL.