1. What is a Bladder Volume Calculator?

Definition: This calculator estimates bladder volume using the ellipsoid formula based on length, width, and height measurements from ultrasound or CT imaging.

Purpose: It helps radiologists and urologists assess bladder capacity and detect abnormalities in urinary function.

2. How Does the Calculator Work?

The calculator uses the ellipsoid formula:

Where:

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

Explanation: The formula approximates the bladder as an ellipsoid shape, which is standard practice in radiological measurements.

3. Importance of Bladder Volume Measurement

Details: Accurate bladder volume assessment is crucial for diagnosing conditions like urinary retention, overactive bladder, and monitoring post-void residuals.

4. Using the Calculator

Tips: Enter the three orthogonal measurements (length, width, height) in centimeters obtained from imaging. 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 10-15% of actual volume) for normally shaped bladders.

Q2: What's a normal bladder volume?
A: Typical adult bladder capacity is 400-600 cm³, but varies by age, sex, and individual factors.

Q3: When would this calculation be inaccurate?
A: For irregularly shaped bladders (e.g., with diverticula or significant trabeculation), the estimate may be less accurate.

Q4: Can I use this for pediatric patients?
A: Yes, but normal volumes are much smaller in children (approximately 30 + (age in years × 30) cm³).

Q5: How do I convert cm³ to ml?
A: They are equivalent (1 cm³ = 1 ml) for clinical purposes.