What it measures
Oestradiol is the main oestrogen. In women it is made mostly by the ovaries and changes through the menstrual cycle; in men it is made mostly from testosterone. Standard tests are less precise at the low levels seen in men and after the menopause.
Why people test it
- Measured when periods are irregular or have stopped, or when fertility is being looked into.
- Used in perimenopause and menopause checks, though levels can swing from day to day.
- Monitored during HRT and fertility care.
- Checked in men with breast tissue growth (gynaecomastia).
- Monitored on TRT, as some testosterone is converted to oestradiol.
- Checked during and after anabolic steroid use, which can raise oestradiol.
Typical range
Ranges vary by lab, method, age and sex, and in women who have periods they depend on the day of the cycle. Your report shows the lab's own range.
Finger-prick or vein?
A vein sample is usually advised. Finger-prick results can be raised by creams or gels on the fingers, especially oestrogen or testosterone gels.