Understanding Your Reproductive Hormone Panel

Section Editors: Christopher McCudden Ph.D., DABCC, FADLM, FCACB and Kamran Mirza MD PhD
June 11, 2026

A reproductive hormone panel is a group of blood tests used to evaluate the hormones that control fertility, the menstrual cycle, sexual development, and reproductive function. The panel includes hormones produced by the brain (the hypothalamus and pituitary gland) and hormones produced by the ovaries and testes. Together, these hormones form a tightly regulated system, and testing several of them at once provides a much clearer picture of how the system works than any single hormone result alone.

This article explains what each hormone in the panel measures, why the tests are ordered, how the results are interpreted together, and what may need to happen next. You may find this article helpful if you are being investigated for infertility, irregular menstrual cycles, low testosterone, delayed or early puberty, or perimenopause and menopause.

Reference ranges for reproductive hormones vary considerably depending on age, sex, the phase of the menstrual cycle, pregnancy, menopausal status, the time of day the blood was drawn, and the laboratory. The reference range that applies to your result is the one printed on your laboratory report, not the typical ranges shown here. Always discuss your results with your doctor, who can interpret them in the context of your symptoms, medical history, and other tests.

How the reproductive hormone system works

Reproductive hormones are controlled by a feedback loop that involves three main structures:

The hypothalamus — a small area at the base of the brain that releases gonadotropin-releasing hormone (GnRH), which signals the pituitary gland.
The pituitary gland — a pea-sized gland just below the hypothalamus that produces follicle-stimulating hormone (FSH) and luteinizing hormone (LH) in response to GnRH. FSH and LH are collectively called gonadotropins because they act on the gonads.
The gonads — the ovaries in women and the testes in men. The gonads produce sex hormones (primarily estradiol and progesterone from the ovaries, and testosterone from the testes) and the reproductive cells (eggs and sperm) needed for fertility.

The sex hormones travel back through the bloodstream to the brain, where they signal the hypothalamus and pituitary to adjust their output. When sex hormone levels are low, the brain releases more GnRH, FSH, and LH to stimulate the gonads. When sex hormone levels are high, the brain reduces its output. This back-and-forth communication is the same feedback loop seen in the thyroid system, and understanding it is key to interpreting a reproductive hormone panel.

In women, this system also drives the menstrual cycle. The levels of FSH, LH, estradiol, and progesterone change in a coordinated pattern throughout each cycle, which is why the timing of blood sampling matters so much for women.

Why is a reproductive hormone panel done?

A reproductive hormone panel is ordered for many reasons, including:

To investigate infertility. When a couple has difficulty conceiving, hormone testing helps determine whether ovulation is occurring, whether ovarian or testicular function is normal, and whether a hormone imbalance is the cause.
To investigate irregular menstrual cycles. Missed, infrequent, prolonged, or heavy periods may reflect a hormonal cause that the panel can identify. Common findings include polycystic ovary syndrome (PCOS), thyroid disease, elevated prolactin, and primary ovarian insufficiency.
To investigate symptoms of low testosterone in men. Fatigue, low energy, reduced sex drive, erectile dysfunction, depressed mood, loss of muscle mass, and infertility may be evaluated with a reproductive hormone panel that focuses on testosterone and the pituitary hormones.
To diagnose or monitor menopause and perimenopause. The transition out of reproductive age is reflected in characteristic changes in FSH, LH, and estradiol. Hormone testing is not always required for diagnosis, but may be helpful in younger women or when the picture is unclear.
To investigate delayed or precocious puberty. When puberty begins unusually early or late, hormone testing helps identify whether the cause is in the brain, the gonads, or elsewhere.
To evaluate gynecomastia or hirsutism. Abnormal breast development in men (gynecomastia) or excess body hair growth in women (hirsutism) may reflect a hormonal imbalance.
To evaluate fertility potential. Some hormones — particularly anti-Müllerian hormone (AMH) — are used to estimate ovarian reserve, the supply of eggs remaining in the ovaries. This is often done as part of fertility planning or before treatments that may affect fertility, such as chemotherapy.
To evaluate a suspected pituitary problem. A pituitary tumor — most commonly a pituitary adenoma — can cause excess prolactin or disrupt the normal control of FSH and LH.

How are the tests performed?

Reproductive hormone tests are performed on a small sample of blood drawn from a vein in the arm. Most can be measured on a single sample, although a few aspects of timing are important and your doctor will give you specific instructions if they apply:

Menstrual cycle timing. In women who have menstrual cycles, the levels of FSH, LH, estradiol, and progesterone change dramatically over the course of the cycle. FSH, LH, and estradiol are often tested on day 2, 3, or 4 of the cycle (counting the first day of bleeding as day 1). Progesterone is most useful when measured about a week before the next expected period (often called a “day 21 progesterone” in a typical 28-day cycle) to confirm that ovulation has occurred. AMH and testosterone can be measured at any time during the cycle.
Time of day for testosterone. Testosterone levels in men follow a daily rhythm, peaking in the morning. A morning sample (typically before 10 a.m.) is preferred. Abnormally low results are usually confirmed with a second morning sample on a different day, since a single low result can occur for many reasons.
Recent medications. Many medications, including hormonal contraceptives and hormone replacement therapy, affect reproductive hormone levels. Your doctor will tell you whether to take, hold, or time any medications around the blood draw.
Recent illness or stress. Acute illness, severe stress, intensive exercise, and significant weight loss can all temporarily affect reproductive hormone levels. Testing is usually best done when you are otherwise well.

Results are usually available within a few days.

The reproductive hormone blood tests

Follicle-stimulating hormone (FSH)

FSH is one of two hormones (with LH) produced by the pituitary gland to control the gonads. In women, FSH stimulates the growth of ovarian follicles, the small fluid-filled sacs in the ovaries that contain developing eggs. In men, FSH supports sperm production in the testes.

FSH levels rise when the ovaries or testes are not producing enough sex hormones, because the pituitary is trying to stimulate them harder. An elevated FSH therefore points the problem toward the gonads, while a low or inappropriately normal FSH points toward the brain or pituitary.

Causes of high FSH:

Menopause and perimenopause, in which the ovaries gradually stop responding to FSH
Primary ovarian insufficiency (sometimes called premature ovarian failure), in which ovarian function declines before age 40
Primary testicular failure (called primary hypogonadism) from causes such as Klinefelter syndrome, prior chemotherapy or radiation, mumps orchitis, undescended testes, or testicular injury
Some types of pituitary tumors that produce FSH (rare)

Causes of low FSH:

Pituitary or hypothalamic dysfunction (often called central or secondary hypogonadism)
Pituitary tumors that disrupt the production of FSH and LH
Hyperprolactinemia (high prolactin), which suppresses FSH and LH
Significant weight loss, intense exercise, or eating disorders
Use of hormonal contraceptives or other medications that suppress the pituitary
Pregnancy (FSH is low during pregnancy)

Luteinizing hormone (LH)

LH is the second pituitary gonadotropin. In women, LH triggers ovulation — the release of an egg from the ovary — and stimulates the ovary to produce progesterone during the second half of the menstrual cycle. In men, LH stimulates the testes to produce testosterone.

LH usually moves in parallel with FSH, although it can move out of step in certain conditions. The combination of LH and FSH results gives more information than either alone.

Causes of high LH:

The same conditions that elevate FSH — menopause, primary ovarian insufficiency, primary testicular failure
Polycystic ovary syndrome (PCOS), in which LH is often elevated and the LH:FSH ratio is high
Normal mid-cycle “LH surge” in a woman who is ovulating (a brief spike of LH triggers ovulation)

Causes of low LH:

The same conditions that suppress FSH — pituitary dysfunction, hyperprolactinemia, eating disorders, severe weight loss, hormonal medications
Pregnancy

Estradiol

Estradiol is the main form of estrogen produced by the ovaries during the reproductive years. It plays a central role in the menstrual cycle, in maintaining bone strength, in the development of secondary sex characteristics, and in many other processes. Small amounts of estradiol are also produced from other sources, including the conversion of testosterone to estradiol in fat and other tissues, which is why estradiol is also present in men, just at much lower levels.

Estradiol changes substantially over the menstrual cycle, rising in the first half of the cycle, peaking just before ovulation, and rising again during the second half. The reference range therefore depends entirely on the cycle phase when the sample is drawn. Estradiol levels are very low after menopause.

Causes of high estradiol:

Normal ovulatory cycle (during the mid-cycle peak)
Pregnancy
Estrogen-producing ovarian tumors (rare)
Ovarian stimulation as part of fertility treatment
Estrogen replacement therapy
Obesity (excess fat tissue increases conversion of testosterone to estradiol)
Severe liver disease

Causes of low estradiol:

Menopause and primary ovarian insufficiency
Hypothalamic or pituitary dysfunction
Significant weight loss, intense exercise, or eating disorders
Treatment with medications that block estrogen (such as aromatase inhibitors used in breast cancer)

Progesterone

Progesterone is produced by the ovary after ovulation, by a temporary structure called the corpus luteum that forms from the ruptured follicle. Its main role is to prepare the lining of the uterus for a potential pregnancy. If pregnancy does not occur, progesterone falls, the uterine lining sheds, and the next menstrual period begins.

Because progesterone rises only after ovulation, measuring it about a week before the next expected period is the most common way to confirm ovulation. A clearly elevated progesterone level at that point supports ovulation; a low level suggests that ovulation did not occur in that cycle.

Causes of elevated progesterone:

Normal post-ovulation (luteal phase) of the menstrual cycle
Pregnancy
Some ovarian tumors and adrenal conditions (rare)

Causes of low progesterone:

Anovulation — cycles in which no egg is released, common in PCOS and during perimenopause
Menopause
Hypothalamic or pituitary dysfunction

Testosterone (total testosterone)

Testosterone is the principal male sex hormone, produced mostly by the testes in men and in smaller amounts by the ovaries and adrenal glands in women. It plays an important role in muscle and bone strength, libido (sex drive), red blood cell production, and other functions in both sexes.

Most testosterone in the blood is bound to a carrier protein called sex hormone-binding globulin (SHBG), with smaller fractions bound to albumin or free (unbound). The total testosterone result measures all of these together. Because protein-bound testosterone is not directly active in tissues, the total testosterone result should be interpreted alongside the SHBG level when it is borderline.

Typical reference ranges differ substantially between men and women. Levels also vary by age — in men, levels decline gradually from early adulthood. Levels follow a daily rhythm, with peak values in the morning, which is why a morning sample is preferred. Abnormal results should usually be confirmed with a second test on a different day, since a single low value can occur for many reasons.

Causes of high testosterone:

Polycystic ovary syndrome (PCOS) — the most common cause of mildly elevated testosterone in women
Congenital adrenal hyperplasia and other adrenal conditions
Testosterone-producing tumors of the ovary, testis, or adrenal gland (rare)
Use of testosterone replacement or anabolic steroids

Causes of low testosterone:

Primary hypogonadism (a problem in the testes), with high FSH and LH
Secondary hypogonadism (a problem in the pituitary or hypothalamus), with low or inappropriately normal FSH and LH
Aging in men (a modest gradual decline)
Chronic illness, obesity, severe stress, or sleep disturbances
Hyperprolactinemia
Use of opioid medications, glucocorticoids, or estrogen therapy

Free testosterone

Free testosterone is the small fraction of testosterone that is not bound to a carrier protein and is therefore available to act on tissues. It is reported alongside total testosterone in some panels and is especially useful when the total testosterone result is borderline or when SHBG is known to be abnormal.

Free testosterone can be measured directly using specialized methods or calculated from the total testosterone and SHBG levels. The directly measured (“free testosterone by equilibrium dialysis”) test is more accurate but more expensive and not always available. The calculated free testosterone is the most common method in routine practice.

A low total testosterone with a normal free testosterone often points to a low SHBG rather than a true deficiency. A normal total testosterone with a low free testosterone may indicate an elevated SHBG.

Sex hormone-binding globulin (SHBG)

SHBG is a protein made by the liver that binds tightly to testosterone and, to a lesser extent, to estradiol, carrying these hormones through the bloodstream. The level of SHBG affects how much hormone is biologically available to tissues.

Several common conditions raise or lower SHBG, which is why SHBG is measured together with testosterone to interpret the result correctly.

Causes of high SHBG:

Aging
Liver disease, including chronic hepatitis
Hyperthyroidism
Estrogen therapy and oral contraceptives
Anorexia or significant weight loss

Causes of low SHBG:

Obesity, insulin resistance, and type 2 diabetes
Polycystic ovary syndrome (PCOS)
Hypothyroidism
Use of androgens or anabolic steroids
Glucocorticoid (steroid) medications

Anti-Müllerian hormone (AMH)

AMH is produced by the small developing follicles in the ovaries, and the amount measured in the blood reflects the size of the pool of remaining ovarian follicles, which is often called ovarian reserve. AMH levels decline naturally with age and reach very low or undetectable values around menopause.

AMH does not vary significantly during the menstrual cycle, so it can be tested at any time. It is widely used in fertility evaluation, in counseling about reproductive timing, and in predicting how a woman is likely to respond to ovarian stimulation during in vitro fertilization (IVF). It does not predict whether someone will become pregnant — only the size of the remaining egg supply.

Causes of high AMH:

Polycystic ovary syndrome (PCOS) — AMH is typically elevated because of the increased number of small follicles
AMH-producing ovarian tumors (rare)

Causes of low AMH:

Aging and the natural decline in ovarian reserve
Primary ovarian insufficiency
Prior chemotherapy or pelvic radiation
Prior ovarian surgery
Menopause

AMH is also produced by the testes in men and is used in pediatric evaluation of testicular function, but it is not a routine part of adult male hormone testing.

Prolactin

Prolactin is a pituitary hormone whose main role is to support breast development and milk production after pregnancy. Prolactin levels are normally low in non-pregnant adults, but become abnormal in several conditions.

High prolactin (called hyperprolactinemia) suppresses the production of FSH and LH and can therefore cause irregular menstrual cycles, infertility, and low testosterone in men. Because of this, prolactin is included in most reproductive hormone panels, particularly when the underlying problem is not clear.

Causes of high prolactin:

Pregnancy and breastfeeding (a normal and expected cause)
A prolactin-producing pituitary adenoma, called a prolactinoma, is the most common type of hormone-producing pituitary tumor
Other pituitary tumors that block normal prolactin regulation
Hypothyroidism
Medications, particularly some antipsychotic medications, anti-nausea drugs (such as metoclopramide and domperidone), and some antidepressants
Chest wall trauma or shingles affecting the chest area
Chronic kidney disease
Stress, recent breast examination, or recent vigorous exercise (modest, transient elevations)

A persistently elevated prolactin level usually prompts imaging of the pituitary gland, typically with an MRI.

Other tests sometimes included

Depending on the clinical picture, additional tests may be added to a reproductive hormone panel:

DHEA-S (dehydroepiandrosterone sulfate) — an adrenal hormone that can be elevated in PCOS, adrenal disease, or rare androgen-producing tumors.
17-hydroxyprogesterone — used to screen for congenital adrenal hyperplasia, an inherited condition that can affect reproductive hormone levels.
TSH (thyroid stimulating hormone) — thyroid disease often affects menstrual cycles and fertility, and TSH is routinely included when investigating menstrual or reproductive problems. See Understanding your thyroid function tests.
Beta-HCG — the pregnancy hormone, often measured before other tests to confirm or exclude pregnancy.
Inhibin B — a hormone produced by the ovaries and testes, sometimes used in fertility evaluation.

How the tests work together: common patterns

Reproductive hormone results are most useful when interpreted as a pattern across several tests. Some of the most common patterns are described below.

Normal ovulatory cycle

In a typical cycle, early-cycle (days 2–4) FSH and LH are in the low-normal range, estradiol is low, and AMH reflects the woman’s age. A progesterone level drawn about a week before the next period is clearly elevated, indicating that ovulation has occurred.

Polycystic ovary syndrome (PCOS)

PCOS is one of the most common causes of irregular periods and infertility in women. Typical hormone findings include a normal or elevated LH with normal FSH (often an LH:FSH ratio>2), elevated total or free testosterone, elevated AMH, and low SHBG. Estradiol is usually normal, but progesterone may be low because ovulation is irregular. Hormone testing alone does not diagnose PCOS — the diagnosis also takes symptoms and ultrasound findings into account — but the hormone pattern is often characteristic.

Menopause and perimenopause

As the ovaries gradually fail, FSH and LH levels rise (sometimes to very high levels), while estradiol falls. AMH becomes very low or undetectable. Progesterone is low. Menopause is usually diagnosed clinically (12 months without a menstrual period) but hormone testing can support the diagnosis, particularly in younger women or when the picture is unclear.

Primary ovarian insufficiency

This condition causes a menopause-like hormonal pattern (high FSH and LH, low estradiol, low AMH) before age 40. The diagnosis usually requires elevated FSH on two separate samples, drawn at least a few weeks apart.

Primary hypogonadism in men

When the testes are unable to produce enough testosterone, FSH and LH levels rise as the pituitary tries to stimulate testosterone production. The pattern is therefore high FSH, high LH, and low testosterone. Common causes include Klinefelter syndrome, prior chemotherapy or radiation, undescended testes, or testicular injury.

Secondary (central) hypogonadism

When the pituitary or hypothalamus fails to send the right signals to the gonads, both the pituitary hormones and the sex hormones are low. In men, the pattern is low or inappropriately normal FSH and LH with low testosterone. In women, the pattern is low or inappropriately normal FSH and LH with low estradiol and absent or irregular periods. Causes include pituitary tumors, severe weight loss, eating disorders, intense exercise, chronic illness, and certain medications. Hyperprolactinemia is a common, reversible cause and should always be ruled out.

Hyperprolactinemia

A persistently elevated prolactin level suppresses FSH and LH and can cause irregular periods, low estradiol, and low testosterone. The hormone pattern looks similar to secondary hypogonadism, but with an obviously high prolactin, pointing to the cause. After confirming the elevation on a repeat sample and ruling out medication causes, a pituitary MRI is usually performed to look for a prolactin-producing tumor.

What happens after a reproductive hormone panel?

The next steps depend on the pattern of results and the reason the test was ordered. Possibilities include:

Repeat the test. Reproductive hormones can vary considerably, and many abnormal results — particularly mildly elevated prolactin or borderline low testosterone — are confirmed with a repeat sample, often drawn at a specific time of day or specific point in the cycle.
Add additional hormones. The initial panel may suggest a specific direction for further testing — for example, adding 17-hydroxyprogesterone if congenital adrenal hyperplasia is suspected, or beta-HCG to confirm or exclude pregnancy.
Imaging. A pelvic ultrasound is often used to evaluate the ovaries and uterus, particularly when PCOS, ovarian tumors, or fertility concerns are being investigated. A pituitary MRI is typically performed when prolactin is persistently elevated, when FSH and LH are low, or when other findings suggest a pituitary tumor. A testicular ultrasound may be performed when primary testicular failure is identified.
Referral to a specialist. Depending on the findings, referral may be made to an endocrinologist (a hormone specialist), a reproductive endocrinologist or fertility specialist, a gynecologist, or a urologist.
Treatment based on the cause. Treatment varies widely. Hormonal contraceptives may be used to regulate cycles in PCOS. Medications that lower prolactin can shrink a prolactinoma and restore normal hormone levels. Testosterone replacement may be considered for confirmed male hypogonadism. Estrogen replacement may be considered for menopause symptoms or primary ovarian insufficiency. Fertility treatments such as ovulation induction or in vitro fertilization may be offered for infertility. The choice of treatment is highly individualized and is made together with the clinician managing the care.
Monitoring over time. In many situations — particularly in perimenopause and fertility planning — hormone testing is repeated at intervals to track changes and adjust management.

An important point to keep in mind is that reproductive hormone results are almost always interpreted in context. The same FSH or testosterone result can mean very different things depending on age, sex, symptoms, cycle phase, and medications. A result that is “outside the reference range” is not always a problem, and a result within the reference range is not always reassuring. Your clinician is the best person to put the pattern together.

Questions to ask your doctor

Why was this panel ordered, and what specific question were you trying to answer?
Which of my results were outside the reference range, and how significant is the difference?
Did the timing of the blood draw (cycle phase, time of day) affect any of the results?
Could any of my medications be affecting my hormone results?
If a result was abnormal, should it be confirmed with a repeat test?
If I am being investigated for infertility, do the results help identify the cause?
If PCOS is suspected, do I also need a pelvic ultrasound?
If my prolactin or pituitary hormones are abnormal, do I need an MRI of the pituitary?
Do my results suggest perimenopause, menopause, or primary ovarian insufficiency?
Should I be referred to an endocrinologist or a reproductive specialist?
When should the tests be repeated?