Definition:
Of the group of hormones that are called estrogens, estradiol is the most abundant. Sometimes abbreviated as E2, estradiol is the hormone most often measured during fertility testing.
By Rachel Gurevich, About.com Guide
Updated August 22, 2008
About.com Health's Disease and Condition content is reviewed by the Medical Review Board
Of the group of hormones that are called estrogens, estradiol is the most abundant. Sometimes abbreviated as E2, estradiol is the hormone most often measured during fertility testing.