Fetal penile length

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Abstract
To construct a reference range for fetal penile length. The length of the penis was measured during ultrasound assessment of 95 structurally normal male fetuses of gestational ages 16–38 weeks. Two fetuses with bladder outflow obstruction were also examined. Fetal penile length increases significantly with gestational age, from a mean value of 6.0 mm at 16 weeks to 26.4 mm at 38 weeks. One fetus with urethral agenesis had a penile length on the 0.3rd centile. Measurement of the fetal penis is easy and not time-consuming. In cases of bladder outflow obstruction, assessment of penile length assists in the differentiation between urethral agenesis and posterior urethral valves. Copyright © 2000 International Society of Ultrasound in Obstetrics and Gynecology