Estradiol
Reads: Estrogen balance
You want it in a healthy range: sufficient estrogen defends bone density and tissue integrity.
What this marker reads
Far more than a reproductive hormone — it guards bone density, vascular flexibility and skin collagen. Its withdrawal at menopause is the single largest hormonal event in human physiology, with consequences traced across five systems.
What a named body publishes
Each line below is the sentence the issuing body wrote, carried with its own identifier. Nothing here interprets your result — it states what was published, for whom, and by whom.
Estradiol
“Estradiol measured daily across the menstrual cycle in 30 healthy premenopausal women by a CDC-traceable LC-MS/MS method gave an early follicular (days -15 to -6) reference interval of 31-771 pmol/L.” females, premenopausal, early follicular phase (cycle days -15 to -6 relative to LH peak)
Estradiol reference intervals in women during the menstrual cycle, postmenopausal women and men using an LC-MS/MS method · Clinica Chimica Acta · 2019 DOI 10.1016/j.cca.2019.04.062 · PMID 30981845
“The same study's late follicular (days -5 to -1) estradiol reference interval was 104-1742 pmol/L.” females, premenopausal, late follicular phase (cycle days -5 to -1)
Estradiol reference intervals in women during the menstrual cycle, postmenopausal women and men using an LC-MS/MS method · Clinica Chimica Acta · 2019 DOI 10.1016/j.cca.2019.04.062 · PMID 30981845
“On the day of the LH peak (day 0) the estradiol reference interval was 275-2864 pmol/L.” females, premenopausal, day of LH peak (day 0)
Estradiol reference intervals in women during the menstrual cycle, postmenopausal women and men using an LC-MS/MS method · Clinica Chimica Acta · 2019 DOI 10.1016/j.cca.2019.04.062 · PMID 30981845
“The early luteal (days +1 to +4) estradiol reference interval was 95-1188 pmol/L.” females, premenopausal, early luteal phase (cycle days +1 to +4)
Estradiol reference intervals in women during the menstrual cycle, postmenopausal women and men using an LC-MS/MS method · Clinica Chimica Acta · 2019 DOI 10.1016/j.cca.2019.04.062 · PMID 30981845
“The mid luteal (days +5 to +9) estradiol reference interval was 151-1941 pmol/L.” females, premenopausal, mid luteal phase (cycle days +5 to +9)
Estradiol reference intervals in women during the menstrual cycle, postmenopausal women and men using an LC-MS/MS method · Clinica Chimica Acta · 2019 DOI 10.1016/j.cca.2019.04.062 · PMID 30981845
“The late luteal (days +10 to +14) estradiol reference interval was 39-1769 pmol/L.” females, premenopausal, late luteal phase (cycle days +10 to +14)
Estradiol reference intervals in women during the menstrual cycle, postmenopausal women and men using an LC-MS/MS method · Clinica Chimica Acta · 2019 DOI 10.1016/j.cca.2019.04.062 · PMID 30981845
“In 33 postmenopausal women the estradiol reference interval was stated as below 26 pmol/L (an upper limit only).” females, postmenopausal
Estradiol reference intervals in women during the menstrual cycle, postmenopausal women and men using an LC-MS/MS method · Clinica Chimica Acta · 2019 DOI 10.1016/j.cca.2019.04.062 · PMID 30981845
“In 64 healthy men the estradiol reference interval was 12-136 pmol/L.” males
Estradiol reference intervals in women during the menstrual cycle, postmenopausal women and men using an LC-MS/MS method · Clinica Chimica Acta · 2019 DOI 10.1016/j.cca.2019.04.062 · PMID 30981845
Your laboratory reads your result against its own assay, and this page does not do that for it. What is above is what a named body published and for whom; what is below is the machinery the marker reads and the formulas witnessed on it.
What moves it
Reproductive axis raises it.
HPG-axis review 2025 — the hypothalamic-pituitary-gonadal axis (GnRH→LH/FSH) drives gonadal estradiol biosynthesis; FSH induces granulosa-cell aromatase to convert androgens to estrogen. PMC12448947
DHEA precursor pool raises it.
The same precursor feeds aromatisation. Carried by the intermediary-metabolism, micronutrient and clinical reviews. doi 10.3390/nu18132141 · PMC9967593
Androgen precursor raises it.
Using labelled steroid infusions in healthy men and women, the authors measured peripheral conversion of circulating androstenedione into estrone and estradiol, quantifying androstenedione as a direct precursor of blood estrogen. doi 10.1172/JCI106185 · PMID 5355335
What it moves
It raises Blood flow (nitric oxide).
Musicki 2009, J Sex Med (PMID 19138376) — estrogen is critical for maintaining vaginal and clitoral blood flow, and its vascular effects are attributed mostly to its regulation of endothelial nitric oxide production; estrogen regulates eNOS by genomic mechanisms (increased mRNA transcription and protein synthesis) and by non-genomic mechanisms. PMID 19138376
It raises Bone health.
Shevde 2000, PNAS — estrogen suppresses RANKL/M-CSF-induced osteoclast differentiation via an ERα-dependent mechanism, protecting bone mass. doi 10.1073/pnas.130200197
It raises Women's hormone balance.
The transition itself is an estrogen event: across the menopausal transition estradiol fell by about 64% while FSH rose more than fivefold, and vasomotor symptoms track those hormonal shifts. PMID 40963750
It lowers Reproductive axis.
The inhibitory effect on gonadotropin secretion is mediated mainly by estradiol from endogenous conversion of testosterone rather than direct androgen action, at least in the pituitary gland. The decisive evidence is a human experiment of nature: basal, GnRH-stimulated and pulsatile evaluation of LH and FSH in two aromatase-deficient men provided direct evidence that circulating estrogens exert an inhibitory control in LH feedback at both the hypothalamic and pituitary levels. And the control condition is just as sharp: the authors did not record any change in LH and FSH secretion when pure androgen DHT was administered — DHT cannot be aromatised, and it does not suppress. What this explains: high aromatase expression in adipose tissue converts androgens to estrogens, which suppress GnRH, LH and FSH and therefore testosterone — hypogonadotropic hypogonadism, reported in 29 to 79 percent of obese men. And the trap: testosterone administration could increase estradiol production, further promoting the inhibitory feedback. Giving the hormone can deepen the suppression that caused the deficiency. The field states its own there is NO clear consensus on the role of estrogen receptor versus androgen receptor signaling in males. The aromatase-deficient men are decisive for estrogen; they do not prove androgen contributes nothing. doi 10.3389/fendo.2014.00001 · PMC10516609
It raises Muscle.
Age-related hormonal changes, including reductions in estrogen and testosterone, may activate myostatin, exacerbating muscle loss. It is the negative regulator the whole anti-sarcopenia drug field targets, and the map cannot currently express it. doi 10.3390/ijms26146740 · PMC13074595
It raises Immune balance.
The interplay between innate and adaptive immune alterations, sex hormones particularly estrogen, and genetic and epigenetic regulators shapes inflammaging’s trajectory and tissue-specific manifestations. A sex difference stated at the level of the mechanism rather than the outcome. doi 10.1016/j.molmet.2023.101755 · PMC11233824
It raises PCOS.
Named across five reviews of the cardiovascular-renal-hepatic-metabolic syndrome as part of the shared mechanism set: ectopic fat accumulation triggered by metabolic reprogramming, oxidative stress and inflammation induced by energy overload, modified lipids, UREMIC toxins, and senescence, as well as insulin resistance pathways activated by pro-inflammatory factors and lipotoxic products, collectively exacerbate simultaneous hepatic and renal injury. doi 10.1038/s41581-026-01066-0 · PMC11725408
It raises Joint wear.
Named across six reviews of bone remodeling and osteoarthritis pathogenesis. Bone remodeling relies on the coordinated actions of bone-resorbing osteoclasts, bone-forming osteoblasts, and osteocytes serving as mechanosensors and local remodeling coordinators. PMC10648156
It lowers Neurovascular calm.
The estrogen withdrawal hypothesis posits that the premenstrual drop in estrogen levels serves as a trigger of migraine attacks. Estrogen withdrawal triggers changes in serotonin metabolism, increases CGRP release and lowers the pain threshold. doi 10.1186/s10194-023-01664-4 · PMID 15196280
It raises Sexual function.
Named across five reviews of erectile and female arousal physiology. Key contributors include reduced nitric oxide bioavailability due to endothelial oxidative stress and inflammation, diminished cavernosal smooth muscle content leading to impaired veno-occlusion, and increased arterial stiffness compounded by metabolic disorders. doi 10.21037/tau-2025-419 · PMID 19138376 · PMC11988752
Formulas that modulate it
Each formula page names this pathway and carries the study behind its claim.
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