1. What is Fluid Deficit Calculation?

Definition: This calculator estimates fluid deficit based on normal and current hydration status percentages and patient weight.

Purpose: Helps medical professionals determine the volume of fluid needed to correct dehydration in patients.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• Deficit — Fluid deficit in milliliters (ml)
• Normal — Normal hydration percentage (typically 60%)
• Current — Current hydration percentage
• Weight — Patient weight in kilograms (kg)
• 0.6 — Conversion factor (60% of body weight is water)

Explanation: The difference between normal and current hydration status is multiplied by weight and conversion factor to estimate total fluid deficit.

3. Importance of Fluid Deficit Calculation

Details: Accurate fluid deficit estimation is crucial for proper rehydration therapy, preventing complications from both under- and over-hydration.

4. Using the Calculator

Tips: Enter normal hydration percentage (typically 60), current hydration percentage, and patient weight in kg. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the typical normal hydration percentage?
A: For adults, normal total body water is approximately 60% of body weight (use 60 in the calculator).

Q2: How do I determine current hydration percentage?
A: Current hydration is typically estimated based on clinical signs of dehydration (mild: 5%, moderate: 10%, severe: 15% deficit).

Q3: Why multiply by 0.6?
A: The 0.6 factor represents that approximately 60% of body weight is water in adults.

Q4: Does this work for children?
A: Children have higher water percentages (infants ~75%). Adjust the 0.6 factor accordingly for pediatric patients.

Q5: How should the deficit be replaced?
A: Typically replace half in first 8 hours and remainder over next 16 hours, adjusting for ongoing losses and clinical response.