Normal Prostate Volume Ultrasound

Prostate Volume Formula:

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

Prostate Volume (cm³):

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1. What is Normal Prostate Volume Ultrasound?

Definition: This calculator estimates prostate volume using ultrasound measurements based on the ellipsoid formula.

Purpose: It helps urologists and radiologists assess prostate size, which is important for diagnosing conditions like BPH or prostate cancer.

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 Measurement

Details: Prostate volume assessment helps in evaluating benign prostatic hyperplasia (BPH), planning surgical interventions, and calculating PSA density.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What is a normal prostate volume?
A: Typically 20-30 cm³ in young men, may increase with age due to BPH (often >40 cm³ in BPH).

Q2: How accurate is this calculation?
A: The ellipsoid formula is about 80-90% accurate compared to planimetry (the gold standard).

Q3: What's the clinical significance of prostate volume?
A: Larger volumes may indicate BPH, affect surgical approach, and influence PSA interpretation (PSA density).

Q4: Can this be used for prostate cancer assessment?
A: Yes, though cancer foci may not significantly change overall volume until advanced stages.

Q5: How does this relate to PSA levels?
A: PSA density (PSA/volume) helps distinguish BPH from cancer, with >0.15 ng/mL/cm³ suggesting higher cancer risk.