Free Water Deficit Calculator
Estimate the free water volume needed to correct hypernatremia based on serum sodium levels.
Input Parameters
Enter details for calculation.
Free Water Deficit
Expert Tip
Correct hypernatremia slowly (max 10 mEq/L per 24 hours) to avoid cerebral edema.
Calculation Methodology & Details
Formula
Estimates the volume of pure water required to return sodium to 140 mEq/L.
Important Disclaimer
The calculations provided are for educational and general informational purposes only. They do not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider.
How Deficit is Calculated
Follow these steps to use this calculator:
Enter Sodium & Weight
Input current labs and weight.
Read Deficit
Plan oral or IV D5W fluid replacement.
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ℹ️ About this Calculation
This clinical electrolyte and fluid resuscitation calculator assists healthcare professionals with osmolality assessment, electrolyte deficit calculations, IV infusion rate adjustments, and fluid management protocols based on intensive care guidelines.
Variable Glossary
Serum & Fluid Metrics
Serum sodium, potassium, calcium, glucose, BUN, albumin, patient body weight, or IV volume parameters.
Resuscitation Targets
Corrected serum sodium/calcium, free water deficit (L), hourly IV drip rate (mL/hr), and calculated osmolality (mOsm/kg).
How to Calculate Step-by-Step
Step 1
Enter current serum electrolyte levels, blood chemistry lab results, or total IV volume ordered.
Step 2
Input patient weight and clinical correction factors (such as hyperglycemic sodium adjustment or albumin level).
Step 3
Review calculated deficit totals, corrected electrolyte values, and recommended IV infusion rates.