Lim et al reported an equation for estimating the size of the prostate gland for an Asian male. The authors are from multiple institutions in Malaysia.
Patient selection: Asian male > 40 years of age
Parameters:
(1) age in years
(2) IPSS score, from 0 to 35
(3) body weight in kilograms
(4) history of alpha-blocker therapy for lower urinary tract symptoms (LUTS)
(5) serum PSA in ng/mL
Parameter
Finding
Points
age in years
0.1 * ((age) - 60)
IPSS
0.1 * (IPSS)
weight
0.3 * ((weight) - 70)
history of alpha-blocker therapy
no
0
yes
9.6
PSA
3.7 * (PSA)
prostate volume in mL =
= SUM(points for all 5 parameters) + 20.6
Performance:
• The area under the ROC curve was 0.82 for a volume of 30 mL and 0.91 for a volume of 40 mL.
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