ABSTRACT
Answer: (a) Micropenis by definition is 2-2.5 standard deviations below the mean for age. For a newborn penis, a stretched length of <2.0 cm fits this criteria. Work-up should evaluate for gonadotropin deficiency and testicular dysgenesis among other causes. AFP and inhibin have no part in this evaluation. Once a work-up is complete, IM testosterone can be given to assess penile growth potential.
