1. What is Bladder Volume Calculation?

The bladder volume calculation estimates urine volume in the bladder using ultrasound measurements of length, width, and height. It's commonly used in urology and for patients with urinary retention.

2. How Does the Calculator Work?

The calculator uses the bladder volume formula:

Where:

• \( Length \) — Longest dimension of bladder (cm)
• \( Width \) — Perpendicular to length (cm)
• \( Height \) — Anteroposterior dimension (cm)
• 0.52 — Correction factor for ellipsoid shape

Explanation: The formula approximates bladder shape as an ellipsoid and applies a correction factor to calculate volume in milliliters.

3. Importance of Bladder Volume Measurement

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

4. Using the Calculator

Tips: Enter bladder dimensions in centimeters from ultrasound measurements. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this calculation?
A: It provides a good estimate (±15-20%) when measurements are taken correctly, though actual volume may vary based on bladder shape.

Q2: When should bladder volume be measured?
A: Common indications include evaluation of urinary retention, monitoring post-void residual, or assessing bladder capacity.

Q3: What is a normal bladder volume?
A: Normal capacity is typically 300-500 mL, but varies by individual. Post-void residual >100-150 mL may be significant.

Q4: Are there limitations to this calculation?
A: Less accurate with irregularly shaped bladders, large diverticula, or when measurements aren't perpendicular.

Q5: Can this be used for pediatric patients?
A: Yes, but normal volumes are much smaller in children and the same formula applies.