A tip of the hat to the late Curt Moyer for
his page on normal estradiol levels in non-obese males. The underlying reference is
here.
Age range: Average estradiol measured by RIA
Looking at the reference we find that the standard deviation for the youngest cohort—with the highest estradiol—is 6.4 pg/mL. So how many men are expected to be above three standard deviations from the average, meaning above 47 pg/mL? The answer, about one in 740. What about four standard deviations, above 54 pg/mL? Answer: about one in 31,574. So you can see that's getting pretty far away from what's expected in healthy young men, whose physiologies we are generally trying to reproduce.