Total Free Water Deficit
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
correção hipernatremia
About this calculator
The Total Free Water Deficit (TFW) calculator is a useful tool for healthcare professionals working with patients who have hypernatremia. This condition occurs when the sodium level in the blood is too high, potentially causing serious health problems.
The formula used by the calculator is simple: Total Body Water (TBW) multiplied by (1 - 140/Na), where Na is the sodium level in the blood. This equation provides the amount of free water that needs to be eliminated from the body to correct hypernatremia.
It's crucial to use this calculator when treating patients with hypernatremia, as it helps determine the correct amount of water that needs to be eliminated to avoid complications. Additionally, it's essential to exercise caution when using this formula, as the incorrect amount of water can cause hydration or dehydration issues.
Moreover, it's essential to remember that this calculator is not a substitute for a doctor's or nurse's guidance but rather a tool to assist them in calculation and decision-making.
Frequently asked questions
What is hypernatremia?
Hypernatremia is a medical condition characterized by an abnormally high sodium level in the blood, which can cause serious health problems. The Total Free Water Deficit calculator helps to correct this condition.
When should I use this calculator?
This calculator should be used when you are treating patients with hypernatremia to help determine the correct amount of water that needs to be eliminated from the body.
What are the precautions when using this calculator?
It is essential to exercise caution when using this formula, as the incorrect amount of water can cause hydration or dehydration issues. Furthermore, this calculator does not replace medical or nursing guidance.
Why is this calculator important?
This calculator is important because it helps to determine the correct amount of water that needs to be eliminated from the body to correct hypernatremia and avoid complications.
What does TBW stand for?
TBW stands for Total Body Water, which is the total amount of water in the human body.