Prostate Volume Calculator Cheng

Prostate Volume Formula (Ellipsoid):

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

Prostate Volume (cm³):

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1. What is the Prostate Volume Calculator (Cheng Method)?

Definition: This calculator estimates prostate volume using the ellipsoid formula, commonly known as the Cheng method.

Purpose: It helps urologists and medical professionals assess prostate size for diagnostic and treatment purposes.

2. How Does the Calculator Work?

The calculator uses the ellipsoid formula:

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

Where:

\( V \) — Prostate volume (cm³)
\( L \) — Length (cm)
\( W \) — Width (cm)
\( H \) — Height (cm)

Explanation: The prostate is modeled as an ellipsoid, and the formula calculates its volume based on three orthogonal measurements.

3. Importance of Prostate Volume Calculation

Details: Prostate volume assessment is crucial for diagnosing benign prostatic hyperplasia (BPH), planning surgical procedures, and evaluating prostate cancer risk.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What is the normal prostate volume range?
A: Typically 20-30 cm³ in young men, may increase with age due to BPH.

Q2: How accurate is the ellipsoid formula?
A: It provides a good estimate (within 10-15% of actual volume) for regularly shaped prostates.

Q3: When would the formula be less accurate?
A: For irregularly shaped prostates or those with significant median lobe enlargement.

Q4: How does prostate volume relate to PSA?
A: PSA density (PSA/volume) is often more clinically relevant than volume alone.

Q5: Can this be used for post-surgical volume estimation?
A: No, the formula is less accurate after surgical procedures that alter prostate shape.