Women with PCOS can have an under production of estrogen. See
here
There is other Sites, but I am on my way to work.
When they do a reference range they take the lowest and highest results and take them in to consideration when reviewing reference ranges.
My last E2 on day 3 was <70(currently being suppressed) and yet last month when on Estrace my E2 sky rocket to 8000.
Since low E2 is common in PCOS a good dr should be able to recognize this and tell you how they will resolve it(if necessary)
Good Luck