Chemistry

Sodium Correction for Hyperglycaemia

Corrected sodium in hyperglycaemia (Katz).

Education and reference only. Not a substitute for clinical judgement, local policy or product labelling. Always verify before clinical use. Values are calculated in your browser and never stored.

When to use

Use in hyperglycaemia (e.g. DKA/HHS) to estimate the true sodium, since high glucose dilutes measured sodium.

Why use

It reveals the underlying sodium disturbance masked by hyperglycaemia.

Critical actions

This uses the Katz factor (1.6 mmol/L per 100 mg/dL above 100). Enter glucose in mg/dL (multiply mmol/L by 18). Some use the Hillier factor of 2.4.

Evidence & references

  1. Katz MA. Hyperglycemia-induced hyponatremia — calculation of expected serum sodium depression. NEJM. 1973.

Related calculators

Calculated Serum OsmolalityEstimated osmolality from electrolytes.Anion GapSerum anion gap for metabolic acidosis.

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