Estrone (E1) blood Biomarker Testing
It measures estrone (E1), an estrogen hormone, to help evaluate hormone balance and treatment effects, with easy ordering through Vitals Vault/Quest.
With Vitals Vault, you have access to a comprehensive range of biomarker tests.
Estrone (E1) is one of the three main estrogens in your body. It is often the dominant estrogen after menopause, and it can also rise when more testosterone is converted to estrogen in fat tissue.
An estrone test can help you and your clinician make sense of symptoms that overlap with many other conditions, such as irregular cycles, hot flashes, breast tenderness, mood changes, or unexpected weight changes.
Because estrogen biology is context-dependent, estrone is most useful when you interpret it alongside related hormones and your life stage (cycling, pregnant, peri/menopausal, or on hormone therapy). Testing supports clinician-directed care and is not, by itself, a diagnosis.
Do I need an Estrone test?
You may consider an estrone test if you are trying to understand estrogen balance during perimenopause or menopause, especially if your symptoms do not match what you would expect from estradiol (E2) alone. Estrone can be a bigger contributor to total estrogen activity later in life, so it sometimes explains why you still feel “estrogenic” even when estradiol looks low.
This test can also be helpful if you are monitoring hormone therapy. Estrone can rise with certain estrogen formulations or with increased conversion of androgens to estrogens (aromatization), so it can add detail when you are adjusting a plan with your clinician.
You might also discuss estrone testing if you have irregular periods, suspected polycystic ovary syndrome (PCOS), or unexplained estrogen-related symptoms. In those cases, estrone is rarely a standalone answer, but it can strengthen the overall pattern when paired with other reproductive hormones.
If you are pregnant, actively trying to conceive, or being evaluated for an estrogen-sensitive condition, ask your clinician which estrogen markers are most appropriate for your situation and timing.
Estrone is measured from a blood sample in a CLIA-certified laboratory; results should be interpreted with your clinician and are not a standalone diagnosis.
Lab testing
Order an estrone test (and add related hormones if you want a fuller picture)
Schedule online, results typically within about a week
Clear reporting and optional clinician context
HSA/FSA eligible where applicable
Get this test with Vitals Vault
Vitals Vault lets you order estrone testing without the usual friction, and you can choose to add companion hormones when you want a more complete picture. Your sample is collected at a participating lab location, and your results are delivered in a format that is easy to review and share.
If you are not sure what your estrone result means for your symptoms, cycle stage, or hormone therapy, you can use PocketMD to ask targeted questions and plan sensible follow-ups. That can include whether retesting makes sense, what to check next, and what changes are worth discussing with your clinician.
Estrone is most informative when you track it over time and interpret it in context, rather than reacting to a single number. Vitals Vault is built for that kind of practical, step-by-step lab planning.
- Order online and test at a nationwide lab network
- Clear results you can share with your clinician
- PocketMD support for next-step questions and retest planning
Key benefits of Estrone testing
- Adds a menopause-relevant estrogen marker when estradiol alone does not match your symptoms.
- Helps clarify overall estrogen exposure when aromatization (conversion from androgens) may be higher.
- Supports safer hormone therapy monitoring by showing how your body is processing estrogen.
- Improves interpretation of irregular cycles when combined with estradiol, progesterone, LH, and FSH.
- Provides context for estrogen-related symptoms such as breast tenderness, fluid retention, or cycle changes.
- Helps you and your clinician distinguish “low estrogen” patterns from mixed or fluctuating patterns.
- Makes it easier to trend hormone balance over time and decide when retesting is actually useful.
What is Estrone?
Estrone (E1) is an estrogen hormone. Compared with estradiol (E2), estrone is generally a weaker estrogen, but it can still have meaningful effects because it can be present at higher levels in certain life stages.
Before menopause, estradiol is usually the dominant estrogen produced by the ovaries, while estrone is produced in smaller amounts and can be made by converting other hormones. After menopause, ovarian estradiol production drops, and estrone made in peripheral tissues (especially fat tissue) often becomes the main circulating estrogen.
Estrone also matters because your body can convert estrone and estradiol back and forth. That means estrone can act as a “reservoir” of estrogen activity, and it can help explain why symptoms and risks do not always line up with estradiol alone.
Where estrone comes from
Estrone is produced in the ovaries and adrenal-related pathways, but a major source is conversion in peripheral tissues. The enzyme aromatase converts androgens (like androstenedione and testosterone) into estrogens, and this activity is higher in adipose tissue. That is one reason estrone can be higher with higher body fat or certain metabolic patterns.
How estrone is used clinically
Estrone is often used as a supporting marker in menopause evaluation, hormone therapy monitoring, and broader reproductive hormone workups. It is not a screening test for cancer, and it is not specific enough to diagnose a single condition on its own. Its value comes from how it fits with your symptoms, medications, and other hormone results.
What do my Estrone results mean?
Low estrone levels
Low estrone is commonly seen when overall estrogen production is low, such as after menopause or with reduced ovarian function. If you are cycling, a low result can also reflect timing, because estrogen levels change across the menstrual cycle. Low estrone may align with symptoms like hot flashes, vaginal dryness, sleep disruption, or low libido, but those symptoms can also have non-hormonal causes.
In-range (expected) estrone levels
An in-range estrone result suggests your estrone level is consistent with the reference interval used by the lab for your sex and sometimes your life stage. “Normal” does not always mean “optimal for you,” especially if you are on hormone therapy or if the sample timing does not match your usual cycle pattern. If symptoms persist, your clinician may look at estradiol, progesterone, and pituitary signals (LH/FSH) to understand the full picture.
High estrone levels
High estrone can occur when aromatase activity is higher, when there is more conversion from androgens, or when estrogen exposure is increased from medications or hormone therapy. In some people, higher estrone is associated with estrogenic symptoms such as breast tenderness, heavier or irregular bleeding (if you still have a uterus), headaches, or mood changes. A single high value should be interpreted carefully, because cycle timing, lab method, and recent hormone use can all shift results.
Factors that influence estrone
Your age and menopausal status strongly affect estrone, and menstrual cycle timing can change results substantially if you are premenopausal. Body composition and insulin resistance can influence aromatase activity and therefore estrone production. Medications and hormones matter too, including oral estrogens, some fertility treatments, and drugs that affect aromatase. Alcohol intake, liver function, and thyroid status can also change how estrogens are metabolized and cleared, which can shift measured levels.
What’s included
- Estrone
Frequently Asked Questions
What is the difference between estrone (E1) and estradiol (E2)?
Estradiol (E2) is usually the strongest and most dominant estrogen during the reproductive years, mainly produced by the ovaries. Estrone (E1) is generally weaker but often becomes the main circulating estrogen after menopause and can rise with increased conversion of androgens to estrogens. Measuring both can help explain symptoms when one marker alone is misleading.
Do I need to fast for an estrone blood test?
Fasting is not usually required for estrone testing. If you are combining estrone with other labs (like lipids, glucose, or insulin), those tests may require fasting, so follow the instructions for your full panel.
When should I test estrone during my menstrual cycle?
Estrone changes across the cycle, so the “best” day depends on the question you are trying to answer. Many clinicians time reproductive hormone testing to the early follicular phase (often cycle day 2–5) or around ovulation/luteal phase for specific evaluations. If your cycles are irregular, note the first day of your last period and any hormone use so your clinician can interpret timing.
Can hormone therapy affect estrone results?
Yes. Estrogen therapy can raise estrone, and some formulations and routes of administration can shift the balance between estrone and estradiol. If you are on hormone therapy, interpret estrone alongside estradiol and your symptoms, and avoid changing doses based on a single lab without clinician guidance.
What tests are commonly ordered with estrone?
Estrone is often paired with estradiol and sometimes estriol as a fractionated estrogen view. Depending on your situation, clinicians also commonly consider progesterone, LH, FSH, testosterone (total and/or free), SHBG, DHEA-S, prolactin, and thyroid markers. The right combination depends on whether the goal is cycle evaluation, menopause assessment, or therapy monitoring.
How often should I retest estrone?
Retesting depends on why you tested in the first place. If you are monitoring a medication or hormone therapy change, clinicians often recheck after several weeks to allow levels to stabilize. If you are evaluating symptoms without a treatment change, retesting is usually most useful when you also adjust timing (cycle day) or add companion markers to answer a clearer question.