Phillip Cheng Prostate Volume

Prostate Volume Formula:

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

Prostate Volume (cm³):

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1. What is the Phillip Cheng Prostate Volume Calculator?

Definition: This calculator estimates prostate volume using the ellipsoid formula (Cheng method) based on length, width, and height measurements.

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

2. How Does the Calculator Work?

The calculator uses the 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 formula approximates the prostate as an ellipsoid and calculates its volume using the three orthogonal measurements.

3. Importance of Prostate Volume Measurement

Details: Prostate volume assessment is crucial for diagnosing BPH (benign prostatic hyperplasia), planning surgical interventions, and monitoring disease progression.

4. Using the Calculator

Tips: Enter the length, width, and height measurements in centimeters (typically obtained via TRUS or MRI). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What imaging methods provide these measurements?
A: Transrectal ultrasound (TRUS) is most common, but MRI and CT can also provide the necessary measurements.

Q2: How accurate is this method?
A: The ellipsoid formula has about 85-90% correlation with actual prostate volume when compared to planimetry.

Q3: What's a normal prostate volume?
A: Typically 20-30 cm³ in young men, often increasing with age (may exceed 100 cm³ in BPH).

Q4: Why use π/6 instead of 0.52?
A: π/6 is the exact mathematical constant (≈0.5236), though some clinicians use the rounded 0.52 for simplicity.

Q5: How does this relate to PSA levels?
A: PSA density (PSA divided by prostate volume) is often more clinically relevant than PSA alone.