1. What is a Bladder Volume Ultrasound Calculator?

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

Purpose: It helps medical professionals assess bladder volume non-invasively for urological evaluations.

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 a filled bladder.

3. Importance of Bladder Volume Measurement

Details: Accurate bladder volume assessment helps diagnose urinary retention, monitor post-void residuals, and evaluate bladder function.

4. Using the Calculator

Tips: Enter the three orthogonal measurements (length, width, height) in centimeters obtained from ultrasound imaging.

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 moderately filled bladders.

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

Q3: When would this calculation be inaccurate?
A: For irregularly shaped bladders, very small volumes, or when the bladder is extremely distended.

Q4: How do I convert cm³ to mL?
A: They are equivalent (1 cm³ = 1 mL), so no conversion is needed.

Q5: What planes should be used for measurements?
A: Measure length in sagittal plane, width and height in transverse plane at maximum dimensions.