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Estradiol is an estrogen, or an agonist of the nuclear estrogen receptors (ERs), the estrogen receptor alpha (ERα) and the estrogen receptor beta (ERβ). [1] [2] [6] In one study, the EC 50 Tooltip half-maximal effective concentration value of estradiol for the human ERα was 50 pM (0.05 nM) and for the human ERβ was 200 pM (0.2 nM).
Levels of estradiol in premenopausal women are highly variable throughout the menstrual cycle and reference ranges widely vary from source to source. [62] Estradiol levels are minimal and according to most laboratories range from 20 to 80 pg/mL during the early to mid follicular phase (or the first week of the menstrual cycle, also known as ...
A higher dosage of estradiol gel containing 1.5 mg estradiol per daily application has been found to produce mean estradiol levels of 40 to 100 pg/mL and estrone levels of 90 pg/mL, while 3 mg per day has been found to result in respective mean estradiol and estrone levels of 60 to 140 pg/mL and 45 to 155 pg/mL. [15]
Estradiol (E2) is a medication and naturally occurring steroid hormone. [11] [12] [13] It is an estrogen and is used mainly in menopausal hormone therapy and to treat low sex hormone levels in women.
Estrogen levels after a single dose of estradiol by different routes ; Route Dose (mg) Time measured ΔE2 levels (pg/mL) ΔE1 levels (pg/mL) E2:E1 ratio Ref Oral 1 2 4: 12 h 3 h 6 h +25 +40 ...
0.15 [5] 0.75 [5] μkat/L Male: 0.15 [5] 1 ... Levels of estradiol (the main estrogen), progesterone, ... Slightly less than osmolality: mOsm/L: Plasma volume ...
The four major naturally occurring estrogens in women are estrone (E1), estradiol (E2), estriol (E3), and estetrol (E4). Estradiol (E2) is the predominant estrogen during reproductive years both in terms of absolute serum levels as well as in terms of estrogenic activity.
[142] [145] The increase in risk is dependent on the duration of treatment, with more than five years (OR = 2.43) having a significantly greater risk than less than five years (OR = 1.49). [142] In addition, sequential estrogen–progestogen treatment ( OR = 1.76) is associated with a lower risk increase than continuous treatment ( OR = 2.90 ...