1. What is a Bladder Volume Calculator?

Definition: This calculator estimates bladder volume using ultrasound measurements based on the ellipsoid formula.

Purpose: It helps medical professionals assess bladder capacity and residual urine volume.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( V \) — Volume of bladder (cm³)
• \( L \) — Length measurement (cm)
• \( W \) — Width measurement (cm)
• \( H \) — Height measurement (cm)

Explanation: The formula calculates the volume of an ellipsoid, which approximates the shape of the bladder.

3. Importance of Bladder Volume Measurement

Details: Accurate bladder volume assessment helps diagnose urinary retention, evaluate bladder function, and guide catheterization needs.

4. Using the Calculator

Tips: Enter the length, width, and height measurements from ultrasound in centimeters. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this calculation?
A: The ellipsoid formula provides a good estimate (within 10-20% of actual volume) for most clinical purposes.

Q2: What's the typical bladder capacity?
A: Average adult bladder capacity is 400-600 mL, but varies by individual.

Q3: How do I convert cm³ to mL?
A: 1 cm³ equals 1 mL, so no conversion is needed.

Q4: When is this calculation most useful?
A: For pre- and post-void residual measurements, or when direct catheterization isn't possible.

Q5: Are there alternative calculation methods?
A: Yes, some use different formulas (like prolate ellipsoid) or 3D ultrasound for more precise measurements.