Hormones & reproductive

Estradiol (E2) test

Estradiol is the main form of estrogen, and it matters for women and men alike.

Included in every $199 draw

Key benefits of estradiol testing

Helps explain irregular cycles, hot flashes, low libido and mood changes.
Adds context to perimenopause and menopause symptoms, though levels swing widely in perimenopause.
In men, flags estrogen that runs too high or too low for energy, libido and bone.
Pairs with testosterone to show hormone balance through the T/E2 ratio.
Gives a baseline before or during any hormone therapy.

What is estradiol?

Estradiol (E2) is made mainly by the ovaries in women. In men, and in women after menopause, most is made from testosterone in fat and other tissues. It acts on the brain, bones, blood vessels and reproductive organs.

Why estradiol matters

Estradiol helps protect bone density, heart health, mood and skin. In women, falling levels drive many menopause symptoms. In men, both too little and too much are linked to low libido and fatigue.

What your estradiol results mean

Low: in women, common in menopause, with very low body fat or heavy training. In men, linked to bone loss and low libido.
In range: healthy hormone output for your age, sex and cycle phase.
High: in women, often reflects cycle timing or hormone therapy; less often, ovarian cysts. In men, often linked to extra body fat or testosterone therapy.
Context matters: in women who still cycle, estradiol swings widely through the month, so note the day of your cycle when you test.

Standard vs. optimal range

	Men	Women
Standard lab range	About 10 to 40 pg/mL (varies by lab)	Varies by cycle phase; usually below 30 pg/mL after menopause
Insyght optimal range	Set by the Insyght medical team	Set by the Insyght medical team

LowHigh

Lab reference rangeYour optimal range

A value can read normal on a standard panel and still sit outside optimal. Insyght flags it.

Do I need an estradiol test?

Cycles changing, sleep slipping or mood swinging more than usual? On testosterone therapy and feeling off? Estradiol is often the missing piece.

Get the full hormone picture

Insyght tests estradiol with total, free and bioavailable testosterone and the T/E2 ratio, reviewed by a physician. $199 a year.

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Similar biomarkers

TestosteroneTestosterone/estradiol ratioProgesterone (women)DHEA-S Cortisol

Frequently asked questions

When should women test estradiol?

If you still have periods, testing on days 2 to 5 of your cycle gives the most comparable baseline. Note the day when you book.

Why do men test estradiol?

Men need some estradiol for bone, libido and brain health. Too much or too little can cause symptoms, especially on testosterone therapy.

Can estradiol confirm menopause?

Not on its own. Menopause is confirmed by 12 months without a period. Estradiol adds context, especially if symptoms start early.

Medically reviewed by Dr. Maria Gutierrez Horn, MD, FACE, Board-certified endocrinologist, in practice since 2001. Last updated October 21, 2026.