Free, no sign-in

Corrected sodium

Sodium corrected for hyperglycaemia, so a dilutional low reading in uncontrolled diabetes is not treated as true hyponatraemia.

An illustration of a clinic toolkit: calculators, checklists, guides and reports

Measured sodium (mmol/L)Glucose (mg/dL)

Fill the fields above and the answer appears here, with the working spelled out — the same working the in-product version saves to the chart.

Nothing you type here is sent anywhere. The calculation runs in your browser and the page keeps no record of it.

How it is worked out

Katz correction: measured Na + 1.6 × (glucose − 100) ÷ 100, with glucose in mg/dL. Some units use the steeper Hillier factor of 2.4; this page shows the Katz arithmetic it is doing.

What it does not do

A correction, not a diagnosis. It does not tell you the volume state, the tonicity or the rate at which sodium may be moved — and over-rapid correction is the harm that matters here.

It is a calculator, not a clinician. Nothing here is medical advice, and the person prescribing owns the decision.

Save this to a patient’s chart

That is the one thing this page cannot do. Inside MedAppz the same calculator writes the value and its working onto the record, so a year later anybody reading the chart can see which numbers produced it. 15 more calculators come with it.

Set up a practice See it in the demo clinic

The other calculators

BMI and body surface area eGFR (CKD-EPI 2021)Paediatric dose Corrected calcium Due date and gestational age