Can a Blood Test Tell You If You're in Menopause?

A blood test for menopause, usually follicle-stimulating hormone (FSH) or estradiol, can add information, but it is often not needed. MedlinePlus (NIH) describes menopause as recognized after 12 months without a period, and clinicians also consider your age and symptoms, because hormone levels can swing from week to week during perimenopause. Bleeding after menopause needs prompt evaluation. This article explains what a blood test can and cannot tell you, when testing is more useful, and what to discuss with your clinician.

Can a blood test tell you if you're in menopause?

Sometimes, but a blood test is often not the main way menopause is identified. MedlinePlus (NIH) describes menopause as the point when periods have stopped, and it is recognized after 12 consecutive months without a period. That definition rests on your menstrual history, not on a lab number. You can read the overview on the MedlinePlus menopause page.

For many women in their late forties or early fifties with typical symptoms, clinicians combine history, examination and, when needed, testing. A normal-looking hormone result does not rule out the transition, and a single abnormal one does not establish it.

Which hormones are tested

FSH (follicle-stimulating hormone)

FSH is made by the pituitary gland and tells the ovaries to mature an egg. As the ovaries respond less, the pituitary may send out more FSH, so levels often rise over the transition. The trouble is that FSH can go up and down from one cycle to the next, so one reading can look "menopausal" in one month and "normal" the next.

Estradiol

Estradiol is the main estrogen made by the ovaries. Levels tend to fall overall after menopause, but during perimenopause they can be high, low or erratic. On its own, an estradiol result is hard to interpret.

Other tests that may be ordered

• Thyroid-stimulating hormone (TSH): thyroid problems can cause irregular periods, hot or cold intolerance, fatigue and mood changes that resemble menopausal symptoms.
• Prolactin: raised levels can interrupt periods.
• Pregnancy test: a missed period at midlife can still be pregnancy.
• Anti-Mullerian hormone (AMH): sometimes used to estimate ovarian reserve, though it is not generally used to diagnose menopause.

Why one result can mislead you

Several factors contribute to hormone readings, and the mechanism of the transition is not fully understood in every woman. During perimenopause, ovulation can still happen unpredictably, so hormones fluctuate. Timing in the menstrual cycle, recent medicines and other conditions can all change a result.

Hormonal birth control and some hormone therapies can alter FSH and estradiol, which can make a result look different from your natural pattern. Tell your clinician about every medicine and supplement you use so they can decide how much weight a result deserves and whether it is worth drawing at all.

When a blood test is more useful

Testing is more likely to help when the picture is not typical. For periods that stop before age 40, clinicians often repeat FSH and estradiol and check for pregnancy, thyroid disease and raised prolactin. Examples of situations where testing may be considered include:

• Periods stopping for months or becoming irregular before age 40, which clinicians may evaluate as possible primary ovarian insufficiency.
• Menopause-like symptoms after surgery to remove the ovaries, or after chemotherapy or pelvic radiation.
• Missed periods where pregnancy, thyroid disease or another condition needs to be sorted out.
• Having had a hysterectomy while keeping the ovaries, so there are no periods to track.

Polycystic ovary syndrome can also cause irregular or absent periods at younger ages. MedlinePlus covers this on its polycystic ovary syndrome page. If your periods are irregular, a missing period does not by itself point to menopause.

Pregnancy can still occur during perimenopause, so ask your clinician how long to continue contraception. It is often continued until a full year without periods, and your clinician can advise for your age and method.

Symptoms that fit the menopausal transition

Common symptoms include hot flashes, night sweats, sleep disruption, vaginal dryness, mood changes and changes in the pattern of periods. Symptoms vary a great deal from person to person, and many women have few of them. Because these symptoms overlap with thyroid disease, anemia, depression and medication effects, a clinician may want to look at the wider picture rather than a hormone number alone. If mood is your main concern, our article on whether a blood test can diagnose depression or anxiety explains why labs have limits there too.

Menopause and health beyond hot flashes

Lower estrogen may be associated with changes in bone and heart health over time. Heart disease risk in women rises with age, so blood pressure and cholesterol deserve attention at midlife. For general information, see the MedlinePlus pages on heart disease in women, high blood pressure and cholesterol. A cholesterol panel is a different test from a menopause hormone test, and it can be worth discussing at this stage of life. Bone density is a separate topic, covered in our article on when older women should get a bone density test.

Treatment decisions do not usually depend on a hormone level

Whether to try treatment is generally based on how much your symptoms bother you and on your personal health history, not on an FSH value. The Menopause Society (formerly the North American Menopause Society) has updated its hormone therapy position statement several times, most recently in 2022. The July 2008 position statement on estrogen and progestogen use in postmenopausal women is linked here only as an older reference and does not reflect current recommendations. Hormone therapy decisions weigh potential benefits against individual risk, including your age, time since menopause and health history. Ask your clinician what the current recommendations say for you.

Menopausal hormone therapy has real risks. Estrogen and estrogen-progestin products carry boxed warnings on their labels about endometrial cancer (with estrogen alone in people who have a uterus, which is why a progestogen is usually added), cardiovascular disorders including stroke and blood clots, breast cancer and probable dementia. Hormone therapy may not suit people with a history of breast cancer, blood clots, stroke, liver disease or unexplained vaginal bleeding, and the balance of risk changes with age and years since menopause, so a prescriber should review it. It should be started and monitored by a clinician. Do not use leftover prescriptions, or hormones bought online or from unregulated sources. Do not change the dose or timing of any prescription on your own; ask your prescriber. Unexpected bleeding while on hormone therapy still needs evaluation.

Many women also try herbal or over-the-counter products. An older systematic review of alternative treatments for menopausal symptoms found that the evidence varies, and evidence for many supplements is limited. Ask your clinician or pharmacist about interactions before starting any supplement.

Bleeding after menopause needs evaluation

Any vaginal bleeding or spotting after you have gone a full year without a period needs evaluation soon. Contact your clinician rather than waiting for a routine visit. It is often caused by benign conditions such as vaginal tissue thinning or polyps, and much less often by changes in the uterine lining such as hyperplasia or cancer, but evaluation is how that is sorted out.

Heavy bleeding is a separate matter. Soaking through a pad or tampon every hour for several hours, or any heavy bleeding with fainting, dizziness, weakness or a racing heart, calls for emergency care. Passing large clots or bleeding much heavier than your usual, without those features, should be assessed by a clinician promptly, usually the same day; heavy bleeding after menopause is unexpected and should not wait for a routine visit. Severe lower abdominal pain with fainting, fever or a possible pregnancy needs emergency evaluation, while severe pain without those features needs same-day assessment. For heavy bleeding in the years before menopause, see our article on heavy periods and when it is too much blood.

How to prepare for the visit

• Note the date of your last period and how your cycles have changed.
• Track hot flashes, sleep and mood for a few weeks.
• List all medicines, birth control and supplements.
• Mention any family history of early menopause, heart disease, osteoporosis or cancer.
• Tell your clinician which symptoms bother you most so they can decide what testing, if any, is appropriate.

When to Seek Medical Care