Normal Bladder Scan Volume Pediatrics

Bladder Volume Formula:

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

Bladder Volume (cm³):

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1. What is Normal Bladder Scan Volume in Pediatrics?

Definition: This calculator estimates normal pediatric bladder volume from ultrasound measurements using the ellipsoid formula adjusted for pediatric norms.

Purpose: Helps healthcare providers assess bladder volume in children for urinary retention evaluation and urological assessments.

2. How Does the Calculator Work?

The calculator uses the formula:

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

Where:

\( V \) — Bladder volume (cm³)
\( L \) — Maximum bladder length (cm)
\( W \) — Maximum bladder width (cm)
\( H \) — Maximum bladder height (cm)

Explanation: The formula calculates the volume of an ellipsoid, which approximates the shape of a distended bladder.

3. Importance of Bladder Volume Measurement

Details: Accurate bladder volume measurement helps diagnose urinary retention, monitor bladder function, and guide catheterization decisions in pediatric patients.

4. Using the Calculator

Tips: Enter the maximum dimensions (length, width, height) in centimeters from bladder ultrasound. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this calculation?
A: The formula has about 85-90% accuracy compared to actual voided volumes in pediatric patients.

Q2: What are normal bladder volumes for children?
A: Normal bladder capacity in ounces ≈ (age in years + 2). Multiply by 30 to convert to cm³.

Q3: When should I be concerned about bladder volume?
A: Post-void residual >20% of expected bladder capacity or >30-40 mL may indicate retention.

Q4: How do I measure bladder dimensions?
A: Use ultrasound to measure the bladder in three orthogonal planes at maximum distension.

Q5: Does this work for newborns?
A: Yes, but normal volumes are much smaller (10-30 mL for term neonates).