1. What is Testis Volume Calculation?

Definition: This calculator estimates testicular volume using the ellipsoid formula based on length, width, and height measurements.

Purpose: It helps radiologists and urologists assess testicular size, which is important for evaluating normal development, atrophy, or pathology.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The formula approximates the testis as an ellipsoid shape. The π/6 factor (≈0.52) is the ellipsoid correction factor.

3. Importance of Testis Volume Measurement

Details: Normal adult testicular volume ranges from 10-20 cm³. Volume assessment helps diagnose conditions like varicocele, orchitis, or testicular atrophy.

4. Using the Calculator

Tips: Enter measurements obtained from ultrasound or physical exam (orchidometer). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the normal range for testicular volume?
A: Normal adult range is 10-20 cm³. Prepubertal testes are typically <4 cm³.

Q2: How accurate is this calculation?
A: The ellipsoid formula has about 90% accuracy compared to water displacement (gold standard).

Q3: When should I be concerned about testis volume?
A: Volume <12 cm³ may indicate atrophy, while significant asymmetry (>2 cm³ difference) may warrant evaluation.

Q4: Can this be used for pediatric patients?
A: Yes, but normal values vary by age and Tanner stage.

Q5: What imaging modality is best for measurements?
A: Ultrasound is most accurate, but physical exam with orchidometer is commonly used.