Biomarker Glossary

Oestradiol

Oestradiol (E2) is the main form of oestrogen in the body. In women it is produced mainly by the ovaries and regulates the menstrual cycle, bone health and many other functions. In men, smaller amounts are produced and play important roles in bone health and libido. An oestradiol blood test is essential for investigating fertility, menopause, hormonal symptoms and oestrogen excess in men.

Also known as: Estradiol, E2, 17 beta oestradiol

Oestradiol is most informative when read alongside related markers like Progesterone and Testosterone. A single number rarely tells the whole story. If your reading sits outside the typical range, share the full report with your GP or healthcare professional before drawing conclusions.

What is Oestradiol?

Oestradiol is the most potent of the three main oestrogens (alongside oestrone and oestriol). In premenopausal women, oestradiol drives the menstrual cycle, supports bone and brain health, maintains skin and vaginal tissues, and influences mood and libido.

Oestradiol levels in women fluctuate significantly across the menstrual cycle. They drop dramatically during menopause, which is why menopause symptoms (hot flushes, vaginal dryness, mood changes, bone loss) reflect oestrogen withdrawal.

In men, oestradiol is produced from testosterone by the enzyme aromatase, particularly in fat tissue. Healthy men need some oestradiol for bone health, libido and brain function, but excess (from obesity, alcohol or some medications) causes problems.

Why test Oestradiol?

  • To confirm menopause or perimenopause.
  • To investigate fertility issues or irregular periods.
  • To monitor hormone replacement therapy (HRT) or oral contraceptives.
  • To investigate gynaecomastia (breast tissue growth) in men.
  • Alongside testosterone in men with low libido, mood changes or weight gain.
To confirm menopause or perimenopause.

Oestradiol normal range (UK)

Result What it means
Women, follicular phase (days 1 to 13): 40 to 200 pmol/L Normal
Women, ovulation: 250 to 1700 pmol/L Normal
Women, luteal phase: 200 to 800 pmol/L Normal
Women, postmenopause: below 100 pmol/L Typical
Men: 40 to 160 pmol/L Normal

Female oestradiol varies dramatically across the menstrual cycle, so timing matters. Day 3 of the cycle is the standard for fertility testing. Postmenopausal women have very low levels unless on HRT. Always interpret oestradiol alongside FSH, LH, progesterone and clinical symptoms.

About these ranges. The ranges above are typical UK clinical lab ranges aligned to NHS and Royal College of Pathologists guidance. Your Chxhealth report will show the specific reference range used by our partner lab, Randox, for each marker. Lab ranges vary slightly between providers and assays. Always interpret your results in the context of the range printed on your own report.

What causes high Oestradiol?

  • Pregnancy (very high levels are normal)
  • Hormone replacement therapy or oral contraceptives
  • Polycystic ovary syndrome (PCOS) in some cases
  • Ovarian or testicular tumour (rare)
  • Adrenal disorders
  • Liver disease (the liver clears oestrogen)
  • In men: obesity (fat tissue converts testosterone to oestrogen), alcohol, anabolic steroid use

What causes low Oestradiol?

  • Menopause and perimenopause
  • Surgical removal of ovaries
  • Pituitary or hypothalamic disorders
  • Excessive exercise and very low body fat (functional hypothalamic amenorrhoea)
  • Eating disorders
  • Some genetic conditions (Turner syndrome)

Symptoms of high Oestradiol

  • Women: breast tenderness, bloating, heavy periods, mood changes, headaches
  • Men: gynaecomastia (breast tissue), low libido, erectile dysfunction, mood changes, water retention

Symptoms of low Oestradiol

  • Women: hot flushes, night sweats, vaginal dryness, irregular or absent periods, low libido, mood changes, sleep problems, joint aches, brain fog, bone loss over time
  • Men: low libido, fatigue, joint pain, bone loss

How is Oestradiol tested?

Oestradiol is measured from a blood sample. In premenopausal women, day 3 of the menstrual cycle is the standard for fertility testing. For other indications, timing is less critical but should be noted.

In men, test in the morning alongside testosterone and SHBG.

If on HRT or contraceptives, results are influenced by medication.

Chxhealth samples are analysed by Randox, a UK laboratory accredited by UKAS. Results return in 3 to 5 working days.

How to support healthy Oestradiol levels

  • Maintain a healthy body weight. Both very low and very high body fat affect oestrogen.
  • Eat enough cruciferous vegetables (broccoli, cauliflower, kale), which support oestrogen metabolism in the liver.
  • Limit alcohol, which raises oestrogen and burdens the liver.
  • Manage stress and sleep, both of which affect hormonal balance.
  • If perimenopausal, speak to a healthcare professional about HRT or other supportive treatments. Chxhealth does not prescribe.

These are general lifestyle suggestions. Chxhealth is an information service. For personal medical advice, please speak to a healthcare professional.

Chxhealth panels that test Oestradiol

8 Chxhealth biomarker panels include Oestradiol. Each is analysed by Randox, a UK laboratory accredited by UKAS. Reports are delivered in 3 to 5 working days.

Oestradiol FAQs

When should I test oestradiol?

For fertility, on day 3 of your cycle alongside FSH and LH. For menopause confirmation, timing is less critical, especially if periods have stopped. For men, in the morning alongside testosterone.

What is a normal oestradiol level for menopause?

Postmenopausal women typically have oestradiol below 100 pmol/L. Combined with high FSH (above 30 IU/L), this confirms menopause.

Can men have too much oestradiol?

Yes. The most common cause is obesity, as fat tissue converts testosterone to oestradiol via the enzyme aromatase. High oestradiol in men can cause gynaecomastia, low libido and erectile dysfunction.

Does HRT raise oestradiol?

Yes. The aim of HRT is to restore oestradiol to premenopausal levels. Monitoring with blood testing helps fine tune the dose.

Why is oestradiol important for bone health?

Oestradiol protects against bone loss. Postmenopausal women lose bone rapidly due to falling oestradiol, which is why osteoporosis risk rises sharply after menopause.

Often tested with Oestradiol

The biomarkers below are commonly investigated alongside Oestradiol because they reveal connected aspects of the same physiological picture:

  • Progesterone: Reported together to interpret cycle phase.
  • Testosterone: Hormone balance benefits from a full sex hormone view.
  • SHBG: SHBG affects how much oestradiol is biologically active.
  • AMH: AMH adds ovarian reserve context to oestradiol.

Choose the right test for your goal

If you are reading about Oestradiol because of a specific health goal, our buying guides walk you through which Chxhealth panels fit:

Sources and further reading

This page is informed by guidance from the NHS, NICE, Royal College of Pathologists and other UK authoritative bodies. For deeper detail or to verify the information, see:

About this page. Last reviewed: 13 May 2026. Next scheduled review: May 2027. This page has not yet been independently reviewed by a clinician. It is written from authoritative UK medical guidance (NHS, NICE, Royal College of Pathologists, peer-reviewed sources) but has not undergone formal clinical sign off.

Important. Chxhealth is a UK information service. We do not diagnose, treat or prescribe. The reference ranges and information on this page are general educational content and should not be used as a substitute for advice from a qualified healthcare professional. For any concerns about your health or results, please speak to your GP or another healthcare professional.