1. What is an Ovarian Volume Calculator?

Definition: This calculator estimates ovarian volume using the prolate ellipsoid formula based on three-dimensional measurements from radiological imaging.

Purpose: It helps radiologists and gynecologists assess ovarian size, which is important for evaluating conditions like PCOS, ovarian cysts, and fertility status.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( V \) — Ovarian volume (cm³)
• \( L \) — Maximum length (cm)
• \( W \) — Maximum width (cm)
• \( H \) — Maximum height (cm)

Explanation: The formula approximates the ovary as an ellipsoid and calculates its volume using the three orthogonal measurements.

3. Importance of Ovarian Volume Measurement

Details: Ovarian volume is a key parameter in gynecological imaging. Increased volume may indicate PCOS (typically >10 cm³) or ovarian pathology, while decreased volume may suggest ovarian failure.

4. Using the Calculator

Tips: Enter the maximum length, width, and height measurements obtained from ultrasound, CT, or MRI. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What imaging modalities can be used?
A: Transvaginal ultrasound is most common, but measurements can also be taken from transabdominal ultrasound, CT, or MRI.

Q2: What's a normal ovarian volume?
A: In premenopausal women, normal volume is typically 3-10 cm³. Postmenopausal ovaries are usually <3 cm³.

Q3: Why is π/6 used in the formula?
A: This constant (≈0.5236) is derived from the volume formula for a prolate ellipsoid, the geometric shape that best approximates an ovary.

Q4: How accurate is this calculation?
A: It provides a good estimation, though actual ovarian shape may vary. 3D ultrasound provides more accurate volume measurements.

Q5: When is ovarian volume measurement clinically important?
A: For PCOS diagnosis (Rotterdam criteria), evaluation of ovarian masses, assessment of ovarian reserve, and monitoring ovarian response to fertility treatments.