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Testosterone levels in males and females ; Total testosterone Stage Age range Male Female Values SI units Values SI units ; Infant: Premature (26–28 weeks) 59–125 ng/dL: 2.047–4.337 nmol/L
The number one thing you want to get tested if you’re symptomatic is your total testosterone levels, which includes all forms of testosterone in your body: unbound free T, SHBG-bound T, and ...
Epitestosterone, or isotestosterone, also known as 17α-testosterone or as androst-4-en-17α-ol-3-one, is an endogenous steroid and an epimer of the androgen sex hormone testosterone. It is a weak competitive antagonist of the androgen receptor (AR) and a potent 5α-reductase inhibitor .
It has an affinity (K d) of 0.25 to 0.5 nM for the human AR, which is about 2- to 3-fold higher than that of testosterone (K d = 0.4 to 1.0 nM) [47] and 15–30 times higher than that of adrenal androgens. [48] In addition, the dissociation rate of DHT from the AR is 5-fold slower than that of testosterone. [49]
The free androgen index, essentially a calculation based on total testosterone and sex hormone-binding globulin levels, is the worst predictor of free testosterone levels and should not be used. [17] Measurement by equilibrium dialysis or mass spectroscopy is generally required for accurate results, particularly for free testosterone which is ...
Notes: Premenopausal women produce about 230 ± 70 μg testosterone per day (6.4 ± 2.0 mg testosterone per 4 weeks), with a range of 130 to 330 μg per day (3.6–9.2 mg per 4 weeks). Footnotes: a = Mostly discontinued or unavailable.
As of 2016, the International Society for the Study of the Aging Male defines late-onset hypogonadism as a series of symptoms in older adults related to testosterone deficiency that combines features of both primary and secondary hypogonadism; the European Male Aging Study (a prospective study of ~3000 men) [10] defined the condition by the presence of at least three sexual symptoms (e.g ...
4-Hydroxytestosterone (4-OHT), also known as 4,17β-dihydroxyandrost-4-en-3-one, is a synthetic anabolic-androgenic steroid (AAS) and a derivative of testosterone that was never marketed.