MD Calc Prostate Volume Calculator

Prostate Volume Formula:

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

Prostate Volume (cm³):

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1. What is the Prostate Volume Calculator?

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

Purpose: It helps 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 benign prostatic hyperplasia (BPH), planning surgical interventions, and evaluating prostate cancer risk.

4. Using the Calculator

Tips: Enter the prostate dimensions (length, width, height) in centimeters as measured by transrectal ultrasound (TRUS) or MRI. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this calculation?
A: The ellipsoid formula provides a good estimate (±10-15%) when compared to planimetry, especially for symmetric prostates.

Q2: What's a normal prostate volume?
A: Typically 20-30 cm³ in young men, often increasing with age (may exceed 100 cm³ in BPH).

Q3: Can I use this for post-TURP measurements?
A: The formula works best for intact prostates; post-surgical anatomy may require different approaches.

Q4: How do I convert cm³ to grams?
A: Multiply by ~1.05 (prostate tissue density is approximately 1.05 g/cm³).

Q5: What's the PSA density formula?
A: PSA (ng/mL) divided by prostate volume (cm³); values >0.15 may suggest increased cancer risk.