Prostate Size 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 Size Calculator MDCalc?

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 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 helps in diagnosing BPH (benign prostatic hyperplasia), 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 ultrasound 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 more precise methods like planimetry.

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: How do I measure prostate dimensions?
A: Measurements are typically taken via transrectal ultrasound (TRUS) or MRI in the axial, sagittal, and coronal planes.

Q4: Why is π/6 used in the formula?
A: This is the ellipsoid volume correction factor (π/6 ≈ 0.52) that converts the product of three diameters to volume.

Q5: Can this calculator estimate prostate weight?
A: Yes, multiply volume by 1.05 g/cm³ (average prostate tissue density) to estimate weight in grams.