1. What is Bladder US Volume Calculation?

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 approximates the bladder as an ellipsoid shape, which is the standard method for ultrasound volume estimation.

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 obtained from ultrasound imaging. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this calculation?
A: The ellipsoid formula has about 90% accuracy compared to actual bladder volumes in most clinical situations.

Q2: What are normal bladder volume ranges?
A: Normal capacity is typically 400-600 mL, but varies by age, gender, and individual factors.

Q3: When would this calculation be used?
A: Commonly used for post-void residual measurements, pre-catheterization assessment, and bladder capacity evaluations.

Q4: How do I convert cm³ to mL?
A: 1 cm³ equals 1 mL, so no conversion is needed - the values are equivalent.

Q5: What's the clinical significance of post-void residual?
A: PVR > 100 mL may indicate urinary retention and warrant further evaluation.