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Prostate Volume Formula:
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Prostate volume is a measurement of the size of the prostate gland, typically calculated using ultrasound or MRI measurements. It's important for diagnosing and monitoring conditions like benign prostatic hyperplasia (BPH) and prostate cancer.
The calculator uses the ellipsoid formula:
Where:
Explanation: The prostate is approximated as an ellipsoid, and the formula calculates its volume based on three orthogonal measurements.
Details: Prostate volume helps assess BPH severity, guide treatment decisions, calculate PSA density (PSA divided by volume), and plan surgical interventions.
Tips: Enter measurements in centimeters from transrectal ultrasound or MRI. All values must be positive numbers. Typical prostate volume is 20-30 cm³ in young men, often increasing with age.
Q1: What is a normal prostate volume?
A: Normal volume is typically 20-30 cm³ in young men, but may increase to 30-100 cm³ with BPH. Volumes >40 cm³ are generally considered enlarged.
Q2: How accurate is this calculation?
A: The ellipsoid formula is about 90% accurate compared to planimetry (gold standard), but may underestimate very large or irregular prostates.
Q3: What's the clinical significance of prostate volume?
A: Larger volumes may correlate with worse BPH symptoms, affect surgical approach, and influence PSA interpretation (PSA density).
Q4: When should prostate volume be measured?
A: During evaluation of lower urinary tract symptoms, abnormal PSA, or before procedures like prostate biopsy or surgery.
Q5: Are there other methods to measure prostate volume?
A: Yes, including planimetry (most accurate), step-section, and water displacement methods, but these require more specialized equipment.