⚕️ For clinical reference only. Not a substitute for professional judgment.

Corrected Sodium Labs

Adjusts measured sodium for hyperglycaemia-induced dilution. Essential in DKA and HHS management to guide fluid therapy.

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Enter sodium and glucose

Enter measured sodium and serum glucose to calculate corrected sodium.

Laboratory Values

Measured Na+

mmol/L

Serum Glucose

mmol/L

Formula

Corrected Na = Measured Na + 0.4 x (Glucose - 5.5) (Katz formula, using mmol/L) Alternative (Hillier): + 0.24 x (Glucose - 5.6) Interpretation: Corrected Na >145: true hypernatraemia despite dilution Use corrected Na to guide fluid choice in DKA/HHS

When to use

DKA — measured Na often low due to osmotic dilution
HHS — corrected Na guides safe fluid resuscitation rate
Any patient with glucose >10 mmol/L and hyponatraemia