1. What is the Bladder Volume Formula?

The bladder volume formula estimates bladder volume from CT measurements using the ellipsoid formula with a correction factor of 0.52. This method is particularly useful when assessing bladder volume in the presence of calcium deposits.

2. How Does the Calculator Work?

The calculator uses the bladder volume formula:

Where:

• \( Length \) — Maximum bladder length in cm
• \( Width \) — Maximum bladder width in cm
• \( Height \) — Maximum bladder height in cm
• \( 0.52 \) — Correction factor for ellipsoid shape

Explanation: The formula approximates the bladder as an ellipsoid and applies a correction factor to account for its actual shape.

3. Importance of Bladder Volume Measurement

Details: Accurate bladder volume measurement is crucial for assessing urinary retention, planning interventions, and evaluating post-void residual volumes, especially in cases with calcifications that might affect other measurement methods.

4. Using the Calculator

Tips: Enter the maximum length, width, and height measurements from CT in centimeters. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why use 0.52 as the correction factor?
A: The factor 0.52 accounts for the bladder's deviation from a perfect ellipsoid shape and has been validated in clinical studies.

Q2: How accurate is this method compared to others?
A: This method is particularly useful when calcium deposits are present, as they can interfere with ultrasound measurements.

Q3: When should this method be used?
A: Ideal for CT-based measurements, especially when assessing post-void residual or in cases where ultrasound is inconclusive due to calcifications.

Q4: Are there limitations to this method?
A: Accuracy may decrease with irregularly shaped bladders or when significant diverticula are present.

Q5: What is a normal bladder volume range?
A: Normal bladder capacity is typically 300-500 mL, but can vary based on individual factors.