A hormone panel is a group of blood tests that measure the chemical messengers controlling reproduction, metabolism and the stress response. It typically combines the sex hormones — testosterone, estradiol and progesterone — with the pituitary hormones that regulate them (FSH, LH and prolactin) and adrenal hormones such as cortisol and DHEA-S. Because these hormones work as feedback loops rather than in isolation, they are interpreted together, and often on a specific day of the menstrual cycle or at a set time of day.
What the hormone panel measures
Hormones travel in a chain of command. The hypothalamus and pituitary gland at the base of the brain release signalling hormones — FSH, LH and prolactin — that instruct the ovaries, testicles and adrenal glands to make the hormones you feel: estradiol, progesterone, testosterone and cortisol. Those end hormones then feed back to turn the signal up or down. Reading a single value out of this loop can mislead: a low sex hormone means something very different depending on whether the pituitary signal above it is high (the gland is trying and the organ is failing) or low (the signal itself has dropped). A hormone panel captures several rungs of the ladder at once, so the pattern — not one number — guides the diagnosis.
Which tests are included
A hormone panel is tailored to the question; a typical selection includes:
- Testosterone (Total) — the main androgen; low in men causes fatigue and low libido, high in women points toward PCOS.
- Free Testosterone — the unbound, active fraction, useful when the total result is borderline.
- Estradiol — the principal estrogen; tracks the cycle, menopause and, in men, excess conversion from testosterone.
- Progesterone — confirms ovulation and supports early pregnancy.
- FSH — the pituitary signal that drives egg and sperm production.
- LH — triggers ovulation and testosterone output; read alongside FSH.
- Prolactin — when high, disrupts periods, fertility and libido, often from a small pituitary adenoma.
- Cortisol — the main adrenal stress hormone, best sampled in the morning.
- DHEA-S — an adrenal androgen that helps locate the source of excess male hormones.
- SHBG — the carrier protein that decides how much sex hormone is free and active.
- AMH — a marker of ovarian reserve.
- hCG — the pregnancy hormone, also used as a tumour marker in specific settings.
- 17-OH Progesterone — screens for non-classic congenital adrenal hyperplasia.
- Parathyroid Hormone (PTH) — regulates calcium and bone on a separate axis; read together with calcium.
When doctors order it
Doctors reach for a hormone panel when symptoms suggest the reproductive or adrenal system is out of balance. In women, common triggers are irregular or absent periods, difficulty conceiving, signs of excess male hormone such as acne and unwanted hair growth, or symptoms of the menopause transition. In men, low libido, erectile difficulty, unexplained fatigue or loss of muscle prompt testosterone testing. Either sex may be checked for milk-like nipple discharge (a prolactin clue), suspected pituitary or adrenal disease, or before and during fertility treatment. Which hormones are chosen — and when in the cycle — depends entirely on the question being asked.
How to prepare
Preparation is about timing more than fasting. Cortisol follows a daily rhythm and is usually drawn between 8 and 9 a.m. Testosterone is also highest in the morning, so a low result is confirmed on an early sample. In menstruating women, FSH, LH and estradiol are often measured on days 2–5 of the cycle, while progesterone is checked about a week before the next period to confirm ovulation. Prolactin is sensitive to stress, exercise and nipple stimulation, so it is drawn rested. Tell the lab if you take hormonal contraception, hormone therapy or biotin supplements, as biotin can distort several of these immunoassays. Results are reported in conventional and SI units — a unit converter helps reconcile them.
How to read the results together
The value of the panel is in the patterns.
- Pituitary signal versus end hormone. High FSH and LH with a low estradiol or testosterone point to the ovary or testicle failing (as in menopause or primary hypogonadism); low FSH and LH with a low sex hormone shift the problem up to the pituitary or hypothalamus.
- Total versus free testosterone. A low total testosterone can mislead when SHBG is high, because the free, active fraction may still be normal — which is exactly why SHBG and free testosterone are measured alongside it.
- The high-androgen work-up in women. A raised testosterone with an LH-dominant pattern suggests PCOS, while 17-OH progesterone screens for congenital adrenal hyperplasia and prolactin rules out a prolactinoma as the cause of missed periods.
When to retest
Hormones fluctuate, so one abnormal value is rarely the final word. Sex hormones are often repeated in the correct phase of the next cycle, and a low testosterone is confirmed on a second morning sample before any diagnosis is made. When treatment or fertility care is under way, a specialist sets the monitoring interval. As always, let the doctor who ordered the panel decide what to recheck and when, rather than re-testing on your own.
