1. What is Testicular Volume Calculation?

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

Purpose: It helps clinicians assess testicular development, monitor puberty progression, and evaluate conditions like varicocele or hypogonadism.

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 the testis as an ellipsoid, with π/6 (≈0.5236) as the shape factor for volume calculation.

3. Importance of Testicular Volume

Details: Testicular volume correlates with spermatogenesis and androgen production. Normal adult range is 15-25 cm³ per testis.

4. Using the Calculator

Tips: Enter measurements in centimeters from ultrasound or orchidometer. All values must be > 0. Compare results with age-specific norms.

5. Frequently Asked Questions (FAQ)

Q1: What are normal testicular volumes by age?
A: Prepubertal (1-3 cm³), Tanner II (4-6 cm³), Tanner III (7-10 cm³), Tanner IV (11-15 cm³), Adult (15-25 cm³).

Q2: How accurate is this formula compared to ultrasound?
A: The ellipsoid formula has >90% correlation with ultrasound volumetric measurements.

Q3: When would volume be abnormally small?
A: In Klinefelter syndrome, hypogonadism, cryptorchidism, or post-chemotherapy.

Q4: What's the clinical significance of asymmetry?
A: >2 cm³ difference may indicate varicocele, torsion, or tumor.

Q5: How does this compare to orchidometer beads?
A: Orchidometer provides estimates while this calculates precise volumes from measurements.