Understanding Hormone Tests (Testosterone, Estrogen, Cortisol)

Why Test Your Hormones?

Hormones are chemical messengers that regulate nearly every function in your body — from your metabolism and mood to your sleep, sex drive, and body composition. Even small imbalances can have a significant impact on how you feel day to day.

Hormone testing is not just for people with obvious problems. Many symptoms that are commonly attributed to aging, stress, or "just life" — fatigue, weight gain, low motivation, poor sleep, brain fog, low libido — can actually be caused by hormone imbalances that are identifiable with a simple blood test and often treatable.

Good to know: You do not need a diagnosis or suspicion of disease to check your hormones. Many people order baseline hormone panels simply to understand their current levels and track changes over time.

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Key Hormones Explained

Testosterone

Testosterone is the primary male sex hormone, but it plays important roles in women too. In men, it regulates sex drive, muscle mass, bone density, fat distribution, red blood cell production, and mood. In women, testosterone contributes to libido, energy, and muscle/bone health at much lower concentrations.

Testosterone levels decline naturally with age — roughly 1% per year after age 30 in men. Low testosterone (hypogonadism) is increasingly recognized as a treatable condition.

Estrogen (Estradiol)

Estradiol (E2) is the most potent and clinically important form of estrogen. In women, it regulates the menstrual cycle, supports bone health, maintains skin and vaginal tissue, and affects mood and brain function. In men, small amounts of estradiol are needed for bone health and brain function, but excess estrogen can cause unwanted effects.

Progesterone

Progesterone is critical for menstrual cycle regulation and pregnancy. It balances the effects of estrogen and supports the uterine lining after ovulation. Low progesterone can cause irregular periods, PMS, and difficulty maintaining pregnancy.

DHEA-S (Dehydroepiandrosterone Sulfate)

DHEA is a precursor hormone produced by the adrenal glands. Your body converts it into testosterone and estrogen as needed. DHEA-S (the sulfated, stable form measured in blood) peaks in your 20s and declines steadily with age. It is sometimes called the "youth hormone."

Cortisol

Cortisol is your primary stress hormone, produced by the adrenal glands. It regulates your stress response, metabolism, blood sugar, immune function, and sleep-wake cycle. Chronically elevated cortisol (from prolonged stress) can lead to weight gain, high blood sugar, immune suppression, and poor sleep. Very low cortisol may indicate adrenal insufficiency.

Thyroid Hormones

Thyroid hormones (TSH, Free T4, Free T3) profoundly affect metabolism and energy. Because thyroid dysfunction closely mimics hormonal imbalance symptoms, thyroid tests are often included in hormone panels. See our detailed thyroid guide for more.

Men's Hormone Panel

A comprehensive men's hormone panel typically includes:

Test	Normal Range (Adult Male)	Unit
Total Testosterone	264 – 916	ng/dL
Free Testosterone	6.8 – 21.5	pg/mL
Estradiol (E2)	10 – 40	pg/mL
DHEA-S	102 – 416	mcg/dL
Cortisol (AM)	6.2 – 19.4	mcg/dL
SHBG	10 – 57	nmol/L
LH	1.8 – 8.6	mIU/mL
FSH	1.5 – 12.4	mIU/mL
Prolactin	4.0 – 15.2	ng/mL
PSA (age 40+)	< 4.0	ng/mL

Important: Reference ranges vary by lab and by age group. The ranges above are common adult ranges. Many endocrinologists consider the lower quartile of "normal" testosterone to still be functionally low if symptoms are present.

Key Markers for Men

SHBG (Sex Hormone-Binding Globulin) — A protein that binds to testosterone, making it unavailable to tissues. High SHBG can make total testosterone look normal while free testosterone is actually low.
LH and FSH — Pituitary hormones that stimulate the testes. Help distinguish between primary (testicular) and secondary (pituitary/brain) causes of low testosterone.
Prolactin — Elevated prolactin in men can suppress testosterone production and may indicate a pituitary issue.
PSA — Prostate health marker, important to check before starting testosterone therapy.

Women's Hormone Panel

A comprehensive women's hormone panel typically includes:

Test	Normal Range (Premenopausal)	Unit
Estradiol (E2)	15 – 350 (varies by cycle phase)	pg/mL
Progesterone	0.1 – 25 (varies by cycle phase)	ng/mL
Total Testosterone	8 – 60	ng/dL
Free Testosterone	0.3 – 1.9	pg/mL
DHEA-S	65 – 380	mcg/dL
Cortisol (AM)	6.2 – 19.4	mcg/dL
LH	2.4 – 12.6 (follicular)	mIU/mL
FSH	3.5 – 12.5 (follicular)	mIU/mL
SHBG	18 – 144	nmol/L
AMH (fertility)	1.0 – 3.5	ng/mL

Cycle timing matters: Estradiol, progesterone, LH, and FSH fluctuate dramatically throughout the menstrual cycle. Testing on cycle day 3 is standard for baseline fertility and hormone assessment. Progesterone is tested around day 21 to confirm ovulation.

Key Markers for Women

FSH (Follicle-Stimulating Hormone) — Elevated FSH with low estradiol indicates diminished ovarian reserve or approaching menopause.
AMH (Anti-Mullerian Hormone) — The best single marker of ovarian reserve (egg supply). Unlike other hormones, AMH can be tested on any day of the cycle.
Testosterone in women — Elevated testosterone can indicate PCOS (polycystic ovary syndrome) and is associated with acne, excess hair growth, and irregular periods.
Progesterone — A mid-luteal (day 21) progesterone above 3 ng/mL generally confirms that ovulation occurred.

Signs of Hormonal Imbalance

In Men

Low energy, chronic fatigue
Decreased sex drive or erectile dysfunction
Loss of muscle mass, increased body fat
Brain fog, poor concentration
Depression, irritability, mood swings
Reduced motivation and drive
Poor sleep quality
Breast tissue enlargement (gynecomastia)

In Women

Irregular or absent periods
Hot flashes, night sweats
Low libido
Weight gain (especially midsection)
Fatigue, brain fog
Mood swings, anxiety, depression
Acne, unwanted facial hair (high androgens)
Hair thinning or loss
Vaginal dryness
Difficulty conceiving

When and How to Test

Best Time of Day

Testosterone levels are highest in the early morning (6 to 9 AM) and decline throughout the day. For accurate results, especially in men being evaluated for low testosterone, blood should be drawn before 10 AM. Cortisol also follows a daily rhythm (highest in the morning), so morning testing is standard.

For Women: Cycle Day Matters

Day 3 (follicular phase) — Best time for baseline FSH, LH, estradiol, and AMH
Day 21 (luteal phase) — Best time for progesterone (to confirm ovulation)
Testosterone, DHEA-S, cortisol — Can be tested any day of the cycle (morning preferred)
Postmenopausal women — Can test any day

Fasting

Hormone tests generally do not require fasting. However, if your panel includes glucose, insulin, or lipids, fasting may be needed for those components. Water is always fine.

Total vs. Free Testosterone

Understanding the difference between total and free testosterone is important for accurate interpretation:

Total testosterone measures all testosterone in your blood — both bound and unbound. About 98% of testosterone is bound to proteins (SHBG and albumin).
Free testosterone measures only the unbound portion — the 2% that is immediately available to enter cells and exert effects. This is the biologically active form.
Bioavailable testosterone includes free testosterone plus the portion loosely bound to albumin (which can dissociate easily). It represents the testosterone actually available to tissues.

Why this matters: Some patients have normal total testosterone but low free testosterone because their SHBG is too high, binding up too much of their testosterone. This is common in older men, men taking certain medications, and men with liver disease. Conversely, obese men may have low SHBG, making total testosterone appear low while free testosterone is adequate.

Recommendation: Always order both total and free testosterone for a complete picture. If free testosterone is not available, ordering SHBG alongside total testosterone allows your doctor to calculate it.

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Frequently Asked Questions

There is no universal starting age. However, if you are experiencing symptoms of hormonal imbalance at any age, testing is appropriate. For men, baseline testosterone testing around age 30 to 35 can be valuable for future comparison, since levels decline with age. For women, hormone testing is commonly done when there are menstrual irregularities, fertility concerns, or symptoms of perimenopause (often starting in the early 40s).

The standard reference range for total testosterone is very wide (roughly 264 to 916 ng/dL). A level of 280 ng/dL is technically "normal" but is at the very bottom of the range, and many men at this level experience symptoms. Many endocrinologists and men's health specialists consider levels below 400 to 500 ng/dL to warrant further evaluation if symptoms are present. Context matters: how you feel is as important as the number.

Absolutely. Chronic stress elevates cortisol, which can suppress testosterone, disrupt thyroid function, and affect estrogen and progesterone levels. Acute stress (like a very poor night of sleep before your test) can also temporarily affect results. For the most accurate picture, try to get tested after a normal night's sleep and avoid testing during periods of extreme stress or illness.

In most states, no. You can order hormone tests through a direct-to-consumer lab service like EZ Lab Tests without a doctor's order. You place your order online, visit a local lab for a blood draw, and receive your results electronically. If your results show an imbalance, we recommend consulting with a healthcare provider to discuss treatment options.

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