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Estrogen, progesterone, and human chorionic gonadotropin (hCG) levels throughout pregnancy. Estrogen, progesterone, and 17α-hydroxyprogesterone (17α-OHP) levels during pregnancy in women. [ 1 ] The dashed vertical lines separate the trimesters .
These are normal physiological adaptations that cause changes in behavior, the functioning of the heart, blood vessels, and blood, metabolism including increases in blood sugar levels, kidney function, posture, and breathing. During pregnancy numerous hormones and proteins are secreted that also have a broad range of effects.
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A low level of estrogen can lead to a non-conception cycle, and a high level of estrogen when LH is at its peak, can lead to lower live birth rates and other complications. [13] During pregnancy, estrogen plays a role in supporting placentation through the modulation of angiogenic factor expression. [13]
During the reproductive years of human females, levels of estradiol are somewhat higher than that of estrone, except during the early follicular phase of the menstrual cycle; thus, estradiol may be considered the predominant estrogen during human female reproductive years in terms of absolute serum levels and estrogenic activity.
[10] [15] During normal human pregnancy, estrogen production increases progressively and extremely high estrogen levels are attained. [19] Estradiol levels range from 1,000 to 40,000 pg/mL across pregnancy, [20] are on average 25,000 pg/mL at term, and reach levels as high as 75,000 pg/mL in some women. [21
In a normal adult female, the normal range of estrogen in the luteal phase (when ovulation happens, as well as the vascular tissue preparing for the potential zygote [3]) is 100 pg/ml, in comparison to the proliferative phase (when the uterine lining is thickening [4]) 40-250 pg/ml. [5]
Estetrol is a major estrogen in the body. [1] [2] In contrast to estrone and estradiol, estetrol is a native estrogen of fetal life. Estetrol is produced exclusively by the fetal liver [1] and is found in detectable levels only during pregnancy, with relatively high levels in the fetus and lower levels in the maternal circulation. [1] [2]