Prostate Volume on Ultrasound

Prostate Volume Formula:

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

Prostate Volume (cm³):

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1. What is Prostate Volume on Ultrasound?

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

Purpose: It helps urologists and radiologists determine prostate size for diagnosing conditions like benign prostatic hyperplasia (BPH).

2. How Does the Calculator Work?

The calculator uses the ellipsoid formula:

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

Where:

\( V \) — Volume of prostate (cm³)
\( L \) — Length (cm)
\( W \) — Width (cm)
\( H \) — Height (cm)

Explanation: The formula approximates the prostate as an ellipsoid, using the three orthogonal measurements from ultrasound.

3. Importance of Prostate Volume Measurement

Details: Accurate prostate volume assessment helps in diagnosing BPH, planning surgeries, and calculating PSA density.

4. Using the Calculator

Tips: Enter the three orthogonal measurements (length, width, height) in centimeters from transrectal 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 to >40 cm³ with BPH.

Q2: How accurate is this method?
A: The ellipsoid formula is about 80-90% accurate compared to planimetry.

Q3: What's the clinical significance?
A: Volume >30-40 cm³ may indicate BPH; >80 cm³ may require surgical intervention.

Q4: Can this be used for prostate cancer assessment?
A: Volume helps calculate PSA density (PSA/volume), which improves cancer detection.

Q5: How do I convert cm³ to grams?
A: Prostate tissue density is ~1.05 g/cm³, so volume in cm³ ≈ weight in grams.