What is Estrodiol?

So I just got a voicemail saying that after 4 days of Follistim, my Estrodiol level is 286, which is really great. I have no idea what that is, so I decided to look it up. 

Apparently it is a sex hormone (hmm...never would have guessed!) that is 10 times as potent as estrone.. Except during the early follicular phase of your period, its serum levels are somewhat higher than that of estrone during the reproductive years of the human female. Thus it is the predominant estrogen during reproductive years both in terms of absolute serum levels as well as in terms of estrogenic activity. During menopause, estrone is the predominant circulating estrogen and during pregnancy estriol is the predominant circulating estrogen in terms of serum levels.

  So basically Im still not sure what all that means, but according to this chart, I'm in a good range :) 

I go back Friday 11/18 for another Estrodiol blood work and ultrasound.

Reference ranges for serum estradiol
Patient type	Lower limit	Upper limit	Unit
Adult female (follicular phase, day 5)			pmol/L
	110[5] 90% PI (used in diagram)	220[5] 90% PI
	19[1] (95% PI)	140[1] (95% PI)	pg/mL
	30[1] (90% PI)	60[1] (90% PI)
Adult female (preovulatory peak)	400[4]	1500[4]	pmol/L
	110[1]	410[1]	pg/mL
Adult female (luteal phase)	70[4]	600[4]	pmol/L
	19[1]	160[1]	pg/mL
	Thanks Wiki :)