1. What is the Bladder Volume Formula?

The bladder volume formula estimates bladder capacity from ultrasound measurements using the ellipsoid formula. It's commonly used in urology and emergency medicine to assess urinary retention.

2. How Does the Calculator Work?

The calculator uses the bladder volume formula:

Where:

• Length — Longest dimension of bladder in sagittal plane
• Width — Transverse dimension
• Height — Anteroposterior dimension
• 0.52 — Correction factor for ellipsoid shape

Explanation: The formula approximates the bladder as an ellipsoid and calculates its volume using the three orthogonal measurements.

3. Importance of Bladder Volume Measurement

Details: Bladder volume measurement helps diagnose urinary retention, assess post-void residual volume, and guide catheterization decisions.

4. Using the Calculator

Tips: Enter all three dimensions in centimeters from ultrasound measurements. Values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this formula?
A: It's reasonably accurate (±15-20%) for volumes >100mL but less precise for very small volumes.

Q2: What's considered a normal bladder volume?
A: Normal capacity is typically 300-500mL, though this varies with age and individual factors.

Q3: When is this measurement most useful?
A: Most valuable for assessing post-void residual or in non-invasive bladder monitoring.

Q4: Are there limitations to this calculation?
A: Less accurate for irregularly shaped bladders or when measurements aren't truly orthogonal.

Q5: Can this replace catheterization?
A: Ultrasound measurement can often avoid unnecessary catheterization but may need confirmation in some cases.