Women's Hormone Panel Explained: What to Test, When, and What Your Results Mean

You're dealing with irregular periods, fatigue, mood swings, weight changes, or hair loss, and someone — your doctor, a friend, or the internet — told you to "get your hormones checked." So you got some blood work, received a printout with numbers and reference ranges, and now you have more questions than answers.

Hormone testing is genuinely useful when done correctly. But "correctly" means ordering the right tests, drawing them at the right time in your cycle, and interpreting them in clinical context — not just comparing numbers to a reference range on a lab report. Here's how to make hormone testing actually informative.

The Core Hormones and What They Tell You

Estradiol (E2)

The primary circulating estrogen in premenopausal women. Produced mainly by the ovarian follicles.

What it indicates: Ovarian function, menopausal status, and estrogen-related symptoms.

When to test: For menstrual cycle evaluation, day 3 of your cycle (early follicular phase) provides your baseline. Mid-cycle testing can confirm ovulation. In perimenopausal or menopausal women, timing is less critical.

Interpretation:

• Premenopausal (day 3): 30-100 pg/mL is typical. Below 30 suggests diminished ovarian reserve.
• Ovulatory surge: 200-400 pg/mL
• Postmenopausal: Below 30 pg/mL
• Significantly elevated: May indicate ovarian cyst, granulosa cell tumor, or exogenous estrogen use

Pitfall: A "normal" estradiol level doesn't rule out hormonal imbalance. Estrogen fluctuates dramatically throughout the day and across the cycle. A single measurement is a snapshot, not a movie.

Progesterone

Produced by the corpus luteum after ovulation. Essential for sustaining pregnancy and regulating the menstrual cycle.

What it indicates: Whether you ovulated and whether your luteal phase is adequate.

When to test: Day 21 of a 28-day cycle (or 7 days after expected ovulation in longer cycles). Testing at the wrong time makes the result uninterpretable.

Interpretation:

• Above 3 ng/mL: Ovulation occurred
• Above 10 ng/mL: Strong ovulation (ideal for fertility)
• Below 3 ng/mL mid-luteal phase: Anovulation or insufficient progesterone production
• Postmenopausal: Below 1 ng/mL

Pitfall: Progesterone is pulsatile — it can vary significantly within a single day. Low progesterone on one blood draw doesn't definitively prove inadequate production without clinical context.

FSH (Follicle-Stimulating Hormone)

Produced by the pituitary gland. Stimulates ovarian follicle development.

What it indicates: Ovarian reserve and menopausal status. The pituitary increases FSH output when the ovaries aren't responding adequately — like pressing the gas pedal harder when the engine isn't revving.

When to test: Day 2-4 of the menstrual cycle.

Interpretation:

• Normal (day 3): 3-10 mIU/mL
• Elevated (above 10-15): Suggests diminished ovarian reserve
• Above 25-30: Approaching or in menopause
• Above 40: Menopausal range
• Low FSH: May indicate pituitary dysfunction or hypothalamic suppression

Pitfall: FSH fluctuates in perimenopause — you can have a "normal" FSH one month and an elevated one the next. A single normal FSH does not rule out perimenopause.

LH (Luteinizing Hormone)

Also from the pituitary. Triggers ovulation with a mid-cycle surge.

What it indicates: Ovulatory function, PCOS (often elevated relative to FSH), and pituitary function.

When to test: Day 2-4 for baseline. The LH surge (detected by home ovulation kits) occurs 24-36 hours before ovulation.

Interpretation:

• Normal (day 3): 2-10 mIU/mL
• LH > FSH (ratio above 2:1): Suggestive of PCOS (though not diagnostic alone)
• Elevated mid-cycle: Ovulatory surge (normal)
• Low: Hypothalamic amenorrhea or pituitary dysfunction

Testosterone (Total and Free)

Yes, women produce testosterone — from the ovaries and adrenal glands. It matters for libido, energy, muscle mass, and androgen-related symptoms.

What it indicates: Androgen excess (PCOS, adrenal conditions) or deficiency (low libido, fatigue, bone loss).

When to test: Morning (testosterone levels peak in the AM). Day 3 of cycle is standard, but timing is less critical than for FSH/LH.

Interpretation:

• Normal total testosterone in women: 15-70 ng/dL
• Elevated: PCOS, adrenal hyperplasia, androgen-secreting tumor (rare if very high)
• Low: May contribute to low libido, fatigue, and bone loss
• Free testosterone is often more clinically useful than total, especially when sex hormone-binding globulin (SHBG) is abnormal

DHEA-S (Dehydroepiandrosterone Sulfate)

An adrenal androgen precursor.

What it indicates: Adrenal androgen production. Helps distinguish ovarian from adrenal sources of androgen excess.

When to test: Anytime — relatively stable throughout the day and cycle.

Interpretation:

• Mildly elevated: Common in PCOS (adrenal component)
• Significantly elevated (above 700 mcg/dL): Evaluate for adrenal tumor or congenital adrenal hyperplasia
• Low: Adrenal insufficiency, aging

Thyroid Hormones (TSH, Free T4, Free T3)

Not technically sex hormones, but thyroid dysfunction mimics nearly every hormonal complaint — fatigue, weight changes, hair loss, menstrual irregularity, mood changes, brain fog.

What it indicates: Thyroid function.

When to test: Anytime. Include in any hormone evaluation.

Interpretation:

• TSH 0.5-2.5 mIU/L: Optimal range (many endocrinologists prefer this tighter range over the lab's broader "normal" of 0.5-4.5)
• TSH above 4.5: Hypothyroidism
• TSH below 0.5: Hyperthyroidism
• Free T4 and Free T3 provide additional information, especially when TSH is borderline

Additional Tests Worth Considering

• AMH (Anti-Mullerian Hormone) — Ovarian reserve marker, important for fertility planning. Can be drawn anytime. Declines with age. Elevated in PCOS.
• Prolactin — Elevated levels can suppress ovulation and cause galactorrhea. Check if periods are absent or irregular.
• SHBG (Sex Hormone-Binding Globulin) — Binds testosterone and estrogen. Low SHBG means more free (active) hormone. Low in insulin resistance, obesity, and PCOS.
• Cortisol — Morning cortisol to screen for adrenal dysfunction.
• Insulin (fasting) — With fasting glucose to calculate HOMA-IR (insulin resistance index). Critical for PCOS evaluation.

Common Mistakes in Hormone Testing

1. Testing at the wrong time — Drawing progesterone on day 10 or FSH on day 18 produces meaningless results.
2. Testing only TSH — Adding free T4 and free T3 catches cases that TSH alone misses.
3. Only checking total testosterone — Free testosterone is often more clinically meaningful.
4. Single-point testing in perimenopause — Hormones fluctuate wildly. One "normal" result doesn't rule out hormonal transition.
5. Relying on reference ranges — Lab "normal" ranges are based on statistical distributions of tested populations, not clinical optimization. A TSH of 4.0 is "normal" by most lab ranges but may be causing symptoms.
6. Testing without symptoms — Random hormone panels in asymptomatic women rarely yield actionable information. Test because you're looking for something specific.

Getting the Right Panel

At CORAL, Dr. Kim orders hormone panels based on your specific symptoms and clinical picture — not a generic "hormone check." The goal is to answer specific clinical questions: Are you ovulating? Are you in perimenopause? Is PCOS driving your symptoms? Is your thyroid contributing?

If you're experiencing symptoms that might be hormonal — irregular periods, fatigue, hair changes, mood shifts, unexplained weight changes, or fertility concerns — [start a visit at coral.clinic/start](https://coral.clinic/start). The right tests, ordered at the right time, with proper clinical interpretation, can make the difference between answers and confusion.