1. What is Urinary Bladder Volume by Age?

Definition: This calculator estimates urinary bladder volume using ellipsoid formula adjusted for age-specific norms.

Purpose: Helps medical professionals assess bladder capacity and detect abnormalities in patients of different ages.

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 ellipsoid formula calculates raw volume which is then adjusted by age-specific factors to account for normal developmental differences.

3. Importance of Bladder Volume Calculation

Details: Accurate bladder volume assessment helps diagnose conditions like urinary retention, overactive bladder, and neurogenic bladder dysfunction.

4. Using the Calculator

Tips: Enter ultrasound measurements of bladder dimensions (length, width, height) and patient age. All values must be ≥ 0.

5. Frequently Asked Questions (FAQ)

Q1: How are the age adjustment factors determined?
A: Factors are based on clinical studies of normal bladder capacity across different age groups.

Q2: What's the typical bladder capacity for adults?
A: Average adult bladder capacity is 400-600 mL, but varies by individual.

Q3: How accurate is this calculation?
A: The ellipsoid method is about 90% accurate compared to actual voided volumes in clinical studies.

Q4: When would bladder volume be abnormal?
A: Volume significantly above or below age norms may indicate pathology requiring further investigation.

Q5: Can this be used for pediatric patients?
A: Yes, the age adjustment makes it suitable for patients of all ages.