Normal Bladder Volume Ultrasound

Bladder Volume Formula:

\[ V = \frac{\pi}{6} \times L \times W \times H \]

Bladder Volume (cm³):

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1. What is Normal Bladder Volume 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 urological evaluations.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ V = \frac{\pi}{6} \times L \times W \times H \]

Where:

\( V \) — Bladder volume (cm³)
\( L \) — Length (cm)
\( W \) — Width (cm)
\( H \) — Height (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) obtained from ultrasound in centimeters. 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 range?
A: Typically 300-500 cm³ when full, but varies by age, gender, and individual factors.

Q3: When would this calculation be inaccurate?
A: For irregularly shaped 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 significant post-void residual?
A: Generally >100 ml in adults, though clinical context matters.