Prostate — Reference values

Prostate — Reference values: Usual adult prostate volume, Prostate volume calculation, PSA density, Intravesical prostatic protrusion.

Brazil: abdominal prostate/male pelvis ultrasound includes bladder, prostate, seminal vesicles and post-void residual by CBR. Transrectal ultrasound better evaluates the prostate and periprostatic structures, but does not routinely include bladder/PVR.

Measurements and reference values

Measurement	Usual value	Note
Usual adult prostate volume	15–30 mL	increases with age; >30 mL suggests benign enlargement in many guidelinesusual: 15–30 mLmild/contextual enlargement: >30–40 mLenlarged: >40 mLlarge: >80 mL✓ applied automatically in the reportSource: AUA benign prostate enlargement / EAU male urinary symptoms / StatPearls
Prostate volume calculation	largura × espessura × comprimento × 0,52	ellipsoid formula; g and mL are used almost interchangeably for planningSource: AIUM / StatPearls / AUA benign prostate enlargement
PSA density	PSA ÷ volume ng/mL/cm³	interpretation depends on age, digital rectal exam, family history and MRIstrong low risk: <0,10low by classic cutoff: 0,10–0,15suspicious/borderline: 0,15–0,20elevated: ≥0,20Source: EAU prostate cancer / AUA early detection / StatPearls
Intravesical prostatic protrusion	<5 mm	measure from bladder base to the tip of the protrusion into the bladder lumengrade I: 0–4,9 mmgrade II: 5–10 mmgrade III: >10 mmSource: International Continence Society
Seminal vesicles — anteroposterior diameter	<15 mm	mainly in transrectal/infertility evaluation; >15 mm suggests dilatationusual: <15 mmborderline: 15–20 mmdilated: >20 mmSource: EAA ultrasound study / male infertility reviews

Classifications and calculators

Calculator — prostate volume, PSA density and intravesical protrusion

Input	Calculation	How to interpret
Volume	largura × espessura × comprimento × 0,52	15–30 mL is commonly the usual adult range.
PSA density	PSA ÷ volume	0.10–0.20 is context-dependent on MRI, age, digital rectal exam and family history.
Intravesical protrusion	distance in mm into bladder lumen	>10 mm is ICS grade III and suggests higher obstruction likelihood.

Assistive calculator: it does not replace serial PSA, digital rectal exam, MRI, urinary symptoms and urologic assessment.

Source: AIUM / AUA benign prostate enlargement / EAU prostate cancer / ICS

Prostate size — benign enlargement planning

Range	Reading	Practical use
<30 mL	Small / usual	Below classic benign enlargement cutoff.
30–40 mL	Mild enlargement	Above 30 mL, but progression depends on symptoms, PSA and residual.
>40–80 mL	Enlarged	EAU uses >40 mL as an example of higher progression risk for considering 5-alpha-reductase inhibitors.
>80–150 mL	Large	Important category for surgical technique selection.
>150 mL	Very large	AUA category for treatment planning.

Source: AUA benign prostate enlargement guideline / EAU male urinary symptoms

Intravesical prostatic protrusion — ICS

Grade	Measure	Interpretation
I	0–4,9 mm	Small protrusion.
II	5–10 mm	Intermediate; correlate with urinary flow and residual.
III	>10 mm	Associated with higher chance of bladder outlet obstruction.

Source: International Continence Society glossary

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