Normal Bladder Volume by Age

Bladder Volume Formula:

\[ V = \frac{\pi}{6} \times L \times W \times H \]

Length (L):

Width (W):

Height (H):

Age:

years

Bladder Volume (cm³):

Age-Adjusted Volume (cm³):

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1. What is Normal Bladder Volume by Age?

Definition: This calculator estimates bladder volume using ellipsoid formula with age-specific adjustments.

Purpose: Helps medical professionals assess bladder capacity and detect abnormalities in different age groups.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ V = \frac{\pi}{6} \times L \times W \times H \]

Where:

\( V \) — Bladder volume (cm³)
\( L \) — Length (cm)
\( W \) — Width (cm)
\( H \) — Height (cm)

Explanation: The formula calculates bladder volume assuming an ellipsoid shape, with age-specific adjustments applied to the result.

3. Importance of Bladder Volume Assessment

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

4. Using the Calculator

Tips: Enter bladder dimensions (length, width, height) in centimeters and patient's age in years. All values must be ≥ 0.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this calculation?
A: The ellipsoid formula provides a good estimate but may vary ±15% from actual volumes measured by catheterization.

Q2: Why include age adjustment?
A: Bladder capacity increases with age, reaching adult size around adolescence. Age adjustments account for normal developmental changes.

Q3: What's a typical adult bladder volume?
A: Most adults have a bladder capacity of 400-600 mL when full, though this varies by individual.

Q4: How do I measure bladder dimensions?
A: Typically done via ultrasound, measuring the bladder in three planes (longitudinal, transverse, and anteroposterior).

Q5: Does this account for pathological conditions?
A: No, this calculates expected normal volumes. Actual clinical assessment is needed for abnormal findings.