Estrogen Test: Results Guide for Canadians (2025)

An estrogen test measures the levels of key reproductive hormones in your blood or urine, helping doctors across Canada evaluate fertility, pregnancy, menopause, and other health concerns. Whether your family doctor or specialist has recommended this test, understanding what it involves can help you feel more prepared and confident about the process.

Understanding Your Estrogen Test Results in Canada

Estrogen testing typically checks for one or more of three hormones — estradiol, estriol, and estrone — each playing a distinct role at different life stages. An estradiol blood test is the most common form ordered for non-pregnant women, while estriol testing is usually reserved for pregnancy monitoring. Results are typically available within 24 hours, and your healthcare provider will interpret them based on your age, health history, and the specific reason for testing.

What Is an Estrogen Test?

Types of Estrogen Measured in an Estrogen Test: Characteristics and Clinical Management

Type of Estrogen	Characteristics	Normal Reference Range (Canada)	Clinical Management
Estradiol (E2)	Most potent and abundant form in reproductive-age women; produced mainly by the ovaries; regulates menstrual cycle and bone density	Follicular phase: 77–921 pmol/L; Postmenopausal: <110 pmol/L	Low levels may indicate menopause or ovarian insufficiency; high levels may suggest ovarian tumours or PCOS; monitored closely during fertility treatments
Estrone (E1)	Primary estrogen after menopause; produced in fat tissue and adrenal glands; weaker than estradiol	Premenopausal: 110–400 pmol/L; Postmenopausal: 22–230 pmol/L	Elevated levels in obese postmenopausal women may increase breast cancer risk; lifestyle modifications and regular screening recommended
Estriol (E3)	Weakest form; produced primarily during pregnancy by the placenta; used as a marker for fetal wellbeing	Non-pregnant adults: <200 pmol/L; rises significantly in pregnancy	Low levels during pregnancy may indicate chromosomal abnormalities (e.g., Down syndrome); assessed as part of prenatal maternal serum screening in Canadian provinces
Estetrol (E4)	Produced exclusively during pregnancy by the fetal liver; has selective tissue action; emerging use in contraceptives	Detectable only during pregnancy; reference ranges under continued research	Used in newer low-dose oral contraceptives approved in Canada; research ongoing for menopausal hormone therapy applications

Estrogen is a group of hormones that play a central role in sexual development and reproductive health. Both women and men produce estrogen, though women produce significantly more. The body makes three main types of estrogen: estradiol, estriol, and estrone.

An estrogen test measures one or more of these hormones using a blood sample or a 24-hour urine collection. Results are usually available within 24 hours. Your healthcare provider will interpret the results based on your age, health history, and the reason for testing.

The Three Types of Estrogen

Estradiol is the most commonly tested estrogen in women who are not pregnant. Its levels change throughout the menstrual cycle. After menopause, estradiol levels drop to a low but steady level.

Estriol is usually measured during pregnancy. The placenta — the organ that connects a baby to its mother — produces large amounts of estriol. It can be detected as early as week nine of pregnancy, and levels rise steadily until birth. Estriol can also be measured in urine.

Estrone is often measured in women who have gone through menopause. It can also be tested in people with certain cancers of the ovary, testes, or adrenal glands. Small amounts of estrone are made throughout the body, especially in fat tissue and muscle, making it the main source of estrogen after menopause.

Why Your Doctor May Order an Estrogen Test

There are several common reasons a healthcare provider in Canada may recommend an estrogen test. The test helps diagnose, monitor, or rule out a number of health conditions.

Your doctor may order an estrogen test for any of the following reasons:

• Prenatal screening: To help detect chromosomal conditions such as Down syndrome. When combined with tests for alpha-fetoprotein (AFP) and human chorionic gonadotropin (hCG), it is called a triple screen test. Fetal ultrasound may also be part of this screening.
• Ovarian tumour evaluation: To assess estrogen-producing tumours in girls before puberty or in women after menopause.
• Unexplained symptoms in men: To investigate conditions such as gynecomastia (enlarged breast tissue in men) or to detect estrogen-secreting tumours in the testes.
• Fertility treatment monitoring: To track how well fertility medications are working. Common fertility drugs include Gonal-F, Follistim, and Repronex.
• Menopause assessment: To evaluate estrogen levels in women experiencing menopausal symptoms.

In Canada, your family doctor or OB-GYN can order this test through your provincial health plan. In most provinces, medically necessary hormone testing is covered. However, some specialized fertility-related tests may involve additional costs. Always confirm coverage with your provincial health authority.

How to Prepare for an Estrogen Test

In most cases, no special preparation is needed before an estrogen test. However, you should inform your healthcare provider about a few things before testing.

Let your doctor know if:

• You are currently menstruating or know where you are in your menstrual cycle.
• You are using oral contraceptives or hormonal birth control such as Depo-Provera or a hormonal IUD.
• You are pregnant or think you might be pregnant.
• You are taking any other medications or supplements, as some can affect hormone levels.

Your doctor or nurse will note the timing of your test within your cycle, as estrogen levels naturally rise and fall throughout the month. This information helps them interpret your results accurately. Health Canada recommends always disclosing all medications and supplements to your healthcare provider before any hormone test.

What Happens During an Estrogen Test

Blood Sample Collection

A trained healthcare professional — such as a nurse or lab technician at a hospital, clinic, or LifeLabs location — will collect your blood sample. The process is quick and straightforward.

Here is what to expect during a blood draw:

• An elastic band is wrapped around your upper arm to make your veins easier to see and access.
• The skin over the vein is cleaned with an alcohol swab.
• A small needle is inserted into the vein, usually in the inner elbow area.
• A collection tube fills with blood.
• The elastic band is removed, and a cotton ball or gauze is pressed over the site as the needle is withdrawn.
• A small bandage is applied to the puncture site.

You may feel a brief sting or pinch when the needle goes in. Some people notice mild discomfort while the needle is in place. However, many people feel little to no pain at all. The entire process usually takes less than five minutes.

24-Hour Urine Collection

For a urine-based estrogen test, you will collect all of your urine over a full 24-hour period. Your doctor or lab will provide a large collection container (approximately four litres) and a smaller container for collecting each sample.

Follow these steps for accurate results:

• When you wake up in the morning, empty your bladder but do not save this first urine. Note the time — this marks the start of your 24-hour collection period.
• For the next 24 hours, collect all urine in the smaller container, then pour it into the large container.
• Keep the large container in the refrigerator throughout the collection period.
• At the end of the 24 hours, empty your bladder one final time and add this last sample to the large container. Record the end time.
• Avoid letting toilet paper, pubic hair, stool, or menstrual blood contaminate the sample.

There is generally no discomfort associated with urine collection. For more detailed guidance on how hormone tests work, visit the Mayo Clinic’s hormone testing resource.

Understanding Your Estrogen Test Results

Estrogen levels vary widely depending on age, sex, and where a woman is in her menstrual cycle. Normal ranges also differ from one laboratory to another, so your doctor will interpret your specific results in context.

Higher than normal estrogen levels may be caused by:

• Ovarian stimulation used in fertility treatments, such as in vitro fertilization (IVF)
• Certain cancers, including ovarian, testicular, or adrenal gland cancer
• Serious liver disease, such as cirrhosis
• Multiple pregnancies, such as twins or triplets

Lower than normal estrogen levels may be linked to:

• Menopause or premature ovarian insufficiency
• Low-functioning pituitary gland (hypopituitarism)
• Polycystic ovary syndrome (PCOS) in some cases
• Extreme weight loss or intense physical training
• Turner syndrome, a chromosomal condition affecting females

Furthermore, a single abnormal result does not always mean something is wrong. Your doctor will consider your full health picture before making any diagnosis or recommending treatment. According to Healthline’s guide to estrogen levels, normal ranges vary significantly based on factors such as age and reproductive status.

When to See a Doctor About Estrogen Levels

You do not need to wait for a crisis to talk to a healthcare provider about your hormone health. There are clear signs that it is time to reach out.

Book an appointment with your family doctor or visit a walk-in clinic if you experience any of the following:

• Irregular or missed menstrual periods
• Unexpected weight gain or difficulty losing weight
• Hot flashes or night sweats outside of expected menopause timing
• Unexplained breast tenderness or changes
• Mood changes, depression, or anxiety that seem linked to your cycle
• Fertility challenges after trying to conceive for 12 months (or six months if you are over 35)
• Signs of early puberty in children

In Canada, your first point of contact should be your family doctor. If you do not have a family doctor, a walk-in clinic can assess your symptoms and order initial bloodwork. Your provincial health plan covers most medically necessary hormone tests, so do not hesitate to ask for a referral to a specialist such as an endocrinologist or gynecologist if needed.

As always, speak with a qualified healthcare provider before drawing any conclusions from your results. This article is for informational purposes only and is not a substitute for professional medical advice.

Frequently Asked Questions About Estrogen Testing

Key Takeaways

• An estrogen test measures estradiol, estriol, and estrone levels in blood or urine.
• Doctors order this test for prenatal screening, fertility monitoring, menopause assessment, and more.
• Both women and men can have this test when medically appropriate.
• Results are usually available within 24 hours and must be interpreted by a healthcare provider.
• In Canada, most medically necessary estrogen tests are covered by provincial health plans.
• If you have symptoms related to hormone imbalance, speak with your family doctor or visit a walk-in clinic.
• This article is for general information only — always consult a qualified healthcare professional for personal medical advice.