What is estrone (E1)?

Estrone is a form of estrogen. It is the main estrogen the body keeps making after menopause and is produced largely in fat tissue and the adrenal glands.

How is estrone different from estradiol?

Estradiol (E2) is the main estrogen during the reproductive years. Estrone (E1) is weaker and becomes more prominent after menopause. Providers sometimes compare the two.

Does the menstrual cycle affect the result?

Yes. Female estrone ranges depend on cycle phase and menopausal status. A provider interprets the value accordingly.

Quest specifies serum in a red-top tube with no gel.

Hormone and endocrine health

Estrone (E1) Blood Test

A blood test that measures estrone, a form of estrogen that becomes the main estrogen after menopause.