Free Water Deficit Calculator

This calculator is designed to help healthcare professionals determine the free water deficit in patients with hypernatremia. It helps estimate the amount of water required to correct sodium levels, based on the patient's weight and current sodium concentration.

Calculate Your Free Water Deficit

Patient's Weight (kg) *

Current Serum Sodium (mmol/L) *

Target Serum Sodium (mmol/L) *

Results

Water Deficit: 0.00 L

Data Source and Methodology

All calculations are based strictly on the formulas and data provided by authoritative medical sources. For more information, visit MDCalc.

The Formula Explained

Water Deficit = Weight (kg) × ((Current Sodium / Target Sodium) - 1)

Glossary of Terms

Weight (kg): The patient's body weight in kilograms.
Current Sodium (mmol/L): The current serum sodium concentration.
Target Sodium (mmol/L): The desired serum sodium concentration.
Water Deficit (L): The volume of water needed to correct sodium levels.

How It Works: A Step-by-Step Example

Consider a patient weighing 70 kg with a current serum sodium of 150 mmol/L, aiming to reach 140 mmol/L. The water deficit is calculated as 70 × ((150 / 140) - 1) = 5.00 L.

Frequently Asked Questions (FAQ)

What is hypernatremia?

Hypernatremia is a condition where there is too much sodium in the blood, often due to dehydration.

Why is it important to calculate water deficit?

Calculating water deficit helps in planning the appropriate fluid replacement therapy to safely correct sodium levels.

Can this calculator be used for pediatric patients?

Yes, but it's important to consult with a healthcare provider, as pediatric fluid management requires specific considerations.

How often should sodium levels be monitored?

Monitoring frequency should be determined by a healthcare provider based on the patient's condition and treatment plan.

Is this calculator a substitute for medical advice?

No, always consult a healthcare professional for medical advice and treatment.

Tool developed by Ugo Candido. Content reviewed by medical professionals.
Last reviewed on: October 20, 2023.

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