1. What is a Bladder Scan Volume Calculator?

Definition: This calculator estimates bladder volume from ultrasound measurements using 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:

• \( V \) — Bladder volume (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 is crucial for diagnosing urinary retention, monitoring post-void residuals, and evaluating bladder function.

4. Using the Calculator

Tips: Enter the three orthogonal measurements (length, width, height) in centimeters from the bladder ultrasound. 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 regularly shaped bladders.

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

Q3: When would this calculation be inaccurate?
A: For irregularly shaped bladders, post-surgical bladders, or when significant trabeculation is present.

Q4: How do I convert cm³ to ml?
A: They are equivalent (1 cm³ = 1 ml) for clinical purposes.

Q5: What's considered a significant post-void residual?
A: Generally >100 cm³ in adults is considered clinically significant, but context matters.