1. What is the Paediatric Bladder Volume Formula?

The paediatric bladder volume formula estimates bladder capacity in children for surgical planning. It provides a simple method to approximate expected bladder volume based on the child's age.

2. How Does the Calculator Work?

The calculator uses the paediatric bladder volume formula:

Where:

• \( Age \) — Child's age in years
• 30 — Multiplier in mL/year

Explanation: The formula accounts for the linear growth of bladder capacity during childhood, adding 2 years to account for baseline capacity in infants.

3. Importance of Bladder Volume Calculation

Details: Accurate bladder volume estimation is crucial for surgical planning, catheter selection, and determining appropriate irrigation volumes in paediatric urological procedures.

4. Using the Calculator

Tips: Enter the child's age in years (must be between 0-18 years). The calculator will estimate the expected bladder volume in milliliters.

5. Frequently Asked Questions (FAQ)

Q1: Why add 2 to the age in the formula?
A: This accounts for baseline bladder capacity in infants (approximately 60 mL at birth).

Q2: What are normal bladder volumes by age?
A: Newborns ~60 mL, 1 year ~90 mL, 5 years ~210 mL, 10 years ~360 mL, adolescents ~400-600 mL.

Q3: When is this formula most useful?
A: Primarily for surgical planning in paediatric urology cases where bladder capacity needs estimation.

Q4: Are there limitations to this formula?
A: Less accurate in children with bladder abnormalities, neurogenic bladder, or prior bladder surgery.

Q5: Should this be used for non-surgical purposes?
A: For functional bladder capacity assessment, uroflowmetry or voiding diaries may be more appropriate.