1. What is Pediatric Testicle Volume Calculator?

Definition: This calculator estimates testicular volume using the ellipsoid formula adjusted for pediatric norms.

Purpose: It helps radiologists and pediatricians assess normal testicular development in children and adolescents.

2. How Does the Calculator Work?

The calculator uses the ellipsoid formula:

Where:

• \( V \) — Volume (cm³)
• \( L \) — Length (cm)
• \( W \) — Width (cm)
• \( H \) — Height (cm)

Explanation: The formula approximates testicle volume by modeling it as an ellipsoid, with π/6 (≈0.5236) as the correction factor.

3. Importance of Testicular Volume Measurement

Details: Testicular volume is a key indicator of pubertal development and helps diagnose conditions like precocious puberty, cryptorchidism, or hypogonadism.

4. Using the Calculator

Tips: Enter the three orthogonal measurements (length, width, height) obtained from ultrasound in centimeters. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What are normal testicular volumes for different ages?
A: Newborns: ~0.5-1 cm³; Prepubertal: 1-2 cm³; Tanner stage II: 2-4 cm³; Adult: 15-25 cm³.

Q2: How accurate is the ellipsoid formula?
A: It's about 90% accurate compared to water displacement (gold standard), and more practical for clinical use.

Q3: Should measurements be taken in any particular orientation?
A: Length is longest axis, width is perpendicular to length in transverse plane, height is remaining dimension.

Q4: When would this calculation be abnormal?
A: Volume >2 SD from mean for age or significant asymmetry (>20% difference between sides).

Q5: How does this compare to orchidometer measurements?
A: Ultrasound measurements are more precise, especially for volumes <4 cm³ where orchidometers are less accurate.