1. What is Bladder Volume Measurement by Ultrasound?

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 diagnostic and monitoring purposes.

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 bladder volume estimation.

3. Importance of Bladder Volume Measurement

Details: Accurate bladder volume assessment is crucial for diagnosing urinary retention, monitoring post-void residual volumes, 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 method?
A: The ellipsoid formula provides a good estimate (within 10-20% of actual volume) for moderately full bladders.

Q2: What are normal bladder volume ranges?
A: Normal bladder capacity is typically 300-500 mL in adults, but varies with age, gender, and individual factors.

Q3: When would this measurement be used?
A: Common uses include evaluating urinary retention, assessing post-void residuals, and monitoring bladder function.

Q4: How do I convert cm³ to mL?
A: 1 cm³ equals 1 mL, so no conversion is needed - the result can be read directly as milliliters.

Q5: Are there alternative calculation methods?
A: Yes, some ultrasound machines use different formulas (like the prolate ellipsoid method) or automated volume calculation tools.