Hormones & markers · In plain English

Oestradiol (E2)

A form of oestrogen produced mainly by the ovaries before menopause. Its level changes as follicles develop and across the menstrual cycle.

Also searched as: estradiol, estrogen, oestrogen, E2 blood test

Why you might see this term

A blood result is interpreted with timing, symptoms, medicines and other hormones; it can also be used during fertility treatment monitoring.

What to keep in mind

A value is not simply good or bad without context. It cannot directly tell you the quality of your eggs or diagnose menopause on its own.

Sources & further reading

Prepared by ProFertility · Updated 23 October 2026.

Educational information based on the linked sources. This explanation is not an individual diagnosis or a treatment recommendation. A term appearing here does not mean the test is necessary or included in a particular kit.

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