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Sodium Deficit & Correction Rate (ODS-Safe)

· Last updated：2026-08-10

This tool is for informational purposes only and does not constitute medical, financial, or legal advice; consult a qualified professional for advice.

Calculate the total body sodium deficit and safe correction rate to prevent ODS. Na⁺ deficit = TBW × (Target − Measured). Default 8 mmol/L/24h for chronic; 12 mmol/L/24h for acute symptomatic. 3% NaCl volume estimated. Derived from Adrogué NEJM 2000, Verbalis 2013, Spasovski 2014, Sterns 2018, and MDCalc. Not medical advice.

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Key facts

Category
Health
Input types
number, select
Output type
json
Sample coverage
4
API ready
Yes

Overview

The Sodium Deficit & Correction Rate calculator estimates total body sodium deficit, time to reach a selected sodium target, and the approximate volume of 3% NaCl based on current sodium, target sodium, weight, sex, age group, and correction-rate limit. It is an educational calculation tool, not medical advice.

When to use

  • Estimate sodium deficit for a selected serum sodium target.
  • Compare the expected correction time at 8 or 12 mmol/L per 24 hours.
  • Estimate the total volume of 3% NaCl corresponding to the calculated sodium deficit.

How it works

  1. 1Enter the measured sodium, target sodium, body weight, sex, and age group.
  2. 2The calculator estimates total body water using the selected sex and age-group coefficient.
  3. 3It calculates sodium deficit as total body water × (target sodium − measured sodium).
  4. 4It applies the selected correction-rate limit and estimates time to target plus approximate 3% NaCl volume.

Use cases

  • Reviewing sodium correction calculations in nephrology or electrolyte-management education.
  • Estimating the size and timing of a planned sodium change for a case study.
  • Creating a transparent calculation record with sodium deficit, correction rate, and 3% NaCl estimate.

Examples

1. Chronic correction estimate for an adult male

Clinician or medical learner

Background

An adult male weighs 60 kg and has a measured sodium of 120 mmol/L. The selected target is 128 mmol/L with an 8 mmol/L per 24-hour correction limit.

Problem

Calculate the estimated sodium deficit and time required to reach the 8 mmol/L increase.

How to use

Enter current sodium 120, target sodium 128, weight 60 kg, select Male and Adult, and choose 8 mmol/L per 24 hours.

Decimal places: 1

Outcome

Estimated total body water is 36 L, sodium deficit is 288 mmol, time to target is approximately 24.0 hours, and estimated 3% NaCl volume is about 561 mL.

2. Acute symptomatic correction estimate for an adult female

Clinician or medical learner

Background

An adult female weighs 50 kg and has a measured sodium of 116 mmol/L. The selected target is 124 mmol/L with a 12 mmol/L per 24-hour correction limit.

Problem

Estimate the sodium deficit and expected time for an 8 mmol/L sodium increase at the selected rate.

How to use

FAQ

What does this calculator estimate?

It estimates total body sodium deficit, time to the selected sodium target, and approximate 3% NaCl volume.

Which inputs are required?

Current sodium, target sodium, weight, sex, age group, and correction-rate limit are required.

What correction-rate options are available?

You can select 8 mmol/L per 24 hours or 12 mmol/L per 24 hours.

How is total body water estimated?

The calculator multiplies body weight by a coefficient based on the selected sex and age group.

Is the calculated 3% NaCl volume a treatment order?

No. It is a mathematical estimate and must not be used as a treatment order or a substitute for clinical judgment.

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Enter current sodium 116, target sodium 124, weight 50 kg, select Female and Adult, and choose 12 mmol/L per 24 hours.

Decimal places: 1

Outcome

Estimated total body water is 25 L, sodium deficit is 200 mmol, time to target is approximately 16.0 hours, and estimated 3% NaCl volume is about 390 mL.