from the beginning to the end of pregnancy , plasma levels of estrone , 17beta-estradiol , and estriol increased from less than 0.5 ng/ml to 2-4 ng/ml , from 1-2.5 ng/ml to 6-10 ng/ml , and from less than 1 ng/ml to 6-10 ng/ml , respectively .
C0032961
pregnancy
C0014942
estrone