Estriol E3 Estriol free
Estriol free in Serum
Estriol also written as Oestriol (E3) is a female sex hormone and belongs to the and estrogens.
Levels of estriol in women who are not pregnant are almost undetectable.
During pregnancy, estriol is produced in very large quantities by the placenta and is one of the most estrogens in the body.
Women produce 3 types of estrogens: estrone (E1), which is responsible for female sex characteristics, estradiol (E2), the most common sex hormone in women, and estriol (E3) which is only produced by the placenta during pregnancy.
Reference range depends on the week of pregnancy.
15-21: 3.7 g / l
22-28: 6.9 g / l
29-31: 2.8-7.9 g / l
32-33: 3.6-10.9 g / l
34-36: 4.0-13.9 g / l
37-38: 6.0-14.6 g / l
39-41: 6.3-22.4 g / l
A rising Estriol is a signal for a multiple pregnancy.
A low Estriol may indicate impaired placental function, hormone therapy, or use of certain antibiotics.
This test is not to be used to estimate prenatal risk!