Prostate Volume Calculator MDCalc

Prostate Volume Formula:

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

Prostate Volume (cm³):

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1. What is a Prostate Volume Calculator?

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

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

3. Importance of Prostate Volume Calculation

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

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What's the normal prostate volume range?
A: Typically 20-30 cm³ in young men, may increase with age (BPH can cause volumes >40 cm³).

Q2: How accurate is this calculation?
A: The ellipsoid formula provides a good estimate but may differ slightly from actual volume by 5-15%.

Q3: What imaging methods provide these measurements?
A: TRUS (transrectal ultrasound) is most common, but MRI and CT can also provide measurements.

Q4: How is prostate volume related to PSA?
A: PSA density (PSA/volume) is often more clinically relevant than PSA alone for cancer risk assessment.

Q5: When is prostate volume important clinically?
A: For BPH management, surgical planning (TURP, prostatectomy), and cancer risk stratification.