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Corrected sodium calculator

High blood glucose pulls water into the blood and dilutes sodium, so the measured value understates the true level. This adds it back both standard ways — Katz (1.6) and Hillier (2.4) per 100 mg/dL of glucose above 100.

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Enter Measured sodium (mEq/L), Serum glucose (mg/dL) and the Corrected sodium calculator works out Corrected — Katz (1.6), Corrected — Hillier (2.4) straight away. For instance, with Measured sodium (mEq/L) = 130 and Serum glucose (mg/dL) = 450 it returns Corrected — Katz (1.6) = 135.6 and Corrected — Hillier (2.4) = 138.4.

How to use it

  1. Enter your values: Measured sodium (mEq/L), Serum glucose (mg/dL).
  2. Read the result instantly: Corrected — Katz (1.6), Corrected — Hillier (2.4).

Frequently asked questions

How does the Corrected sodium calculator work?

It takes Measured sodium (mEq/L) and Serum glucose (mg/dL) and derives Corrected — Katz (1.6) and Corrected — Hillier (2.4) from them. The calculation is live as you type, so the result updates on every change.

Which values does the calculator ask for?

2 values: Measured sodium (mEq/L) and Serum glucose (mg/dL). Nothing else is required — no account, no file upload.

What does a typical calculation look like?

With Measured sodium (mEq/L) = 130 and Serum glucose (mg/dL) = 450, the calculator returns Corrected — Katz (1.6) = 135.6 and Corrected — Hillier (2.4) = 138.4. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

How much does the result change with different inputs?

It moves a lot. Using Measured sodium (mEq/L) = 260 and Serum glucose (mg/dL) = 900 instead, Corrected — Katz (1.6) goes from 135.6 to 272.8 — which is why it is worth testing a few scenarios rather than trusting a single figure.

What does it give for smaller values?

Scaled down to Measured sodium (mEq/L) = 65 and Serum glucose (mg/dL) = 225, Corrected — Katz (1.6) comes out at 67. The relationship is worth checking at both ends before you rely on a single result.

When would I actually use this?

Checking one clinical number against the definition that gives it meaning: a dose against a body weight, a laboratory value corrected for the albumin or glucose that distorted it, a blood pressure against a guideline's threshold table, a heart rate or a basal metabolic rate against the formula that defines it.

What is the most common mistake?

Reading the output as a finding. Every figure here is arithmetic on numbers you typed: a correction formula measures nothing, and a threshold table classifies one reading rather than a person. Blood pressure in particular means little until it has been measured repeatedly on separate occasions, and a dose worked out here is a way of checking a prescription, never of writing one.

How accurate is it, and what are the limits?

Educational tool — not medical advice. Correlate clinically.

What is the difference between the Corrected sodium calculator and the Corrected calcium calculator?

This one returns Corrected — Katz (1.6) and Corrected — Hillier (2.4); the Corrected calcium calculator returns Corrected calcium (mg/dL). That is the whole difference — open the one whose figure you need.

Is there a tool for the next step?

Sodium intake calculator is the closest one after this: See your recommended daily sodium limit based on age.

Further reading

All guides →
ExplainerCorrected Sodium, and Why Glucose Moves ItHigh blood glucose pulls water out of cells and dilutes the sodium in it, so a measured sodium in a hyperglycaemic patient reads lower than the real one. Here is the correction, both of the published factors, a case where they disagree by 4 mmol/L, and the different problem that lipids cause.ExplainerCorrected Calcium: Why Albumin Changes the NumberAbout half of blood calcium is bound to albumin and inactive, so a total-calcium result on a low-albumin patient reads low even when the active fraction is normal. Here is the correction in both unit systems, a worked case, and the honest verdict on how badly it performs.ExplainerThe Insulin Sensitivity Factor and the 1800 RuleThe correction factor says how far one unit of insulin moves glucose, and the classical estimate is 1800 divided by the total daily dose in mg/dL — or 100 divided by it in mmol/L. Those are the same rule, and here is the arithmetic that proves it, plus why stacking is the error that actually hurts.ExplainerWeight-Based Dosing, and Where the Arithmetic Goes WrongMilligrams per kilogram is one multiplication, and that is exactly why it fails: the documented errors are unit slips, misplaced decimal points and the wrong body weight, not hard maths. Here is the arithmetic done properly, the three body weights that give three different answers, and what body surface area changes.ExplainerHow Blood Type Is Inherited: The Full Parent-to-Child TableEach parent passes on one ABO allele — A, B or O — and Rh follows a separate gene. Here is every parent combination, which child types it can and cannot produce, and why this is not a paternity test.ExplainerHow Long Does Alcohol Stay in Your System?The body clears roughly one standard drink per hour. See how long alcohol stays in blood, breath and urine — and why you can't rush it.