Estradiol — Female Cycle + Perimenopause Marker
Estradiol is the main estrogen of the reproductive years. Its level changes across the menstrual cycle, so read a result with cycle day or menopausal status.
Estradiol is the main estrogen in females of childbearing age, and its blood level changes across the menstrual cycle — so a result only makes sense read with cycle day or menopausal status, and against the lab's own range. Estrogen testing may be used, often alongside FSH and LH, to help assess perimenopause and irregular periods.
The biomarker
- Name: Estradiol (Women)
- Units: pg/mL
- Standard reference range: Premenopausal 30–400 pg/mL (varies with the menstrual cycle); postmenopausal 0–30 pg/mL (ranges vary by lab)
How to read your result
| Status | Typical range (pg/mL) |
|---|---|
| Premenopausal | 30–400 — varies with the menstrual cycle; read with cycle day |
| Postmenopausal | 0–30 |
| Outside the lab's range | Ask your clinician; estrogen testing is often read alongside FSH and LH |
What moves the needle
- Track. Note the cycle day of the draw and tell your clinician.
- Medicines. Tell your clinician about birth control or menopause hormone therapy before the test — do not stop any medicine unless they tell you to.
- Clinician. OB/GYN referral for symptom-led concerns.
Why this test is worth asking for
- Estradiol is mostly made in the ovaries and helps release an egg each cycle, so its level is tied to where you are in the cycle.
- A single reading only makes sense alongside cycle day or menopausal status — the typical range differs before and after menopause.
- It is one of the tests a clinician may use, with FSH and LH, when periods become irregular or stop.
Related protocols
Sources
AgeGen lab guides are educational only. We do not provide medical diagnosis, prescribe brands, or recommend specific doses. Talk to a licensed clinician before changing your supplement or medication routine.
