Estradiol
Also known as E2
The primary circulating estrogen — central to reproductive, bone, cardiovascular and cognitive health in both sexes.
Definition
Estradiol is the main estrogen produced by the ovaries in premenopausal women and by aromatisation of testosterone in men and postmenopausal women. It regulates reproductive function and has broad effects on bone density, cardiovascular function and cognition. Interpretation requires context — cycle phase in premenopausal women, hormone-therapy status in menopause, ratio to testosterone in men.
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Testosterone
The primary male androgen — measured as total and free fractions. Low levels in men drive the TRT decision; in women, context is everything.
BiomarkerSHBGSex Hormone-Binding Globulin
A hepatic protein that binds testosterone and estradiol — affects how much hormone is bioavailable and how lab values are interpreted.
BiomarkerBiomarker
A measurable substance in blood, tissue or urine that reflects a biological state — the inputs your clinician uses to choose the right protocol.
$149 panel.
A clinician reads it in 24 hours.
Order the Peptide Readiness Panel, draw at a Quest or LabCorp near you, and your clinician sends back a matched protocol with a confidence score.