Hormone Testing

Hormone results are easier to make sense of once you know that the markers fall into a few different jobs. Some are signals: LH and FSH are released by the pituitary gland in the brain and act as instructions sent to the ovaries or testes. Prolactin is another pituitary hormone, best known for its role in milk production but relevant in several other situations.

Others are the hormones those instructions produce. Estradiol is the main estrogen through the reproductive years; estrone and total estrogens describe the wider estrogen picture; progesterone rises after ovulation. DHEA-sulfate is an androgen precursor made largely by the adrenal glands. Growth hormone and IGF-1 belong to a separate axis governing growth and tissue repair.

One marker does a different job again. SHBG, or sex hormone binding globulin, is a carrier protein that grips sex hormones in the blood. How much SHBG is present changes how much hormone is free to reach tissues, so measuring it can explain a result that otherwise looks puzzling. Signal, product, and carrier — most hormone panels are some combination of those three.

The reproductive hormones run on a feedback loop. The brain sends a signal, the glands respond, and the amount produced feeds back to adjust the next signal. Because of that loop, a single number is often ambiguous on its own: the same estradiol result means something different depending on whether the pituitary signal driving it is quiet or loud.

That is why clinicians typically order a small group rather than one marker. A signal hormone and the hormone it drives are read as a pair, and a carrier protein is added when free availability is part of the question. A group also has a practical advantage — everything comes from one draw at one moment, so the results describe the same point in time and can be compared to each other without guesswork.

For people who menstruate, the common reasons are irregular or absent periods, questions about fertility and ovulation, symptoms that arrive around perimenopause and menopause, and symptoms suggesting higher androgen activity such as acne, unwanted hair growth, or scalp hair thinning. Unexpected milk production or persistent headaches sometimes prompt a look at prolactin.

For men, hormone testing usually starts with low energy, reduced libido, erectile difficulties, loss of muscle or strength, or fertility questions. Testosterone markers sit in the men's health category, but LH, FSH, prolactin, estradiol, and SHBG are frequently ordered alongside them, because those markers say whether a testosterone result is being driven from the brain or from the testes.

There are reasons that apply to anyone: following hormone therapy or gender-affirming therapy over time, working through unexplained fatigue or mood changes, following up a bone density finding, or checking the growth axis when a clinician has a specific reason to. People also test simply to establish a baseline while they feel well, so a later result has something to be compared against. Whatever the reason, results describe a moment; a clinician is the one who decides what they mean alongside symptoms, examination, and history.

"Hormone testing" covers more ground than one category can, and the right starting point depends on the symptom. Fatigue with weight, temperature, or hair changes usually points first at thyroid testing, since thyroid hormones drive metabolic rate. Questions about stress response, unusual fat distribution, or salt cravings sit with adrenal and cortisol testing. Testosterone-led questions are grouped under men's health, and cycle, fertility, and menopause panels are grouped under women's health.

This category holds the sex and reproductive markers themselves — the ones the other categories draw on — plus the growth-axis markers. If you already know which marker you want, ordering it here is the direct route. If you are starting from a symptom rather than a marker name, the symptom pages and the category pages are usually a faster way in, and a clinician can narrow a long list to the few markers that address your actual question.

Hormones move on schedules, and a sample taken at the wrong moment can be difficult to interpret. Across a menstrual cycle, estradiol, LH, and FSH shift substantially, and clinicians commonly ask for early-cycle collection when those are the markers in question. Progesterone tells its story after ovulation, so a luteal-phase sample is the one usually requested.

Time of day matters for some markers too, which is why morning collection is a frequent instruction. Prolactin is sensitive to sleep, stress, recent exercise, and nipple stimulation, so clinicians sometimes ask for a repeat sample under calmer conditions before reading much into a single result. Hormonal contraception, hormone therapy, fertility medications, and some other prescriptions influence these markers as well — mention what you take, because context changes interpretation more here than for most blood tests.

None of that requires elaborate preparation. Most hormone tests do not call for fasting. The instructions supplied with your order will say if anything specific applies.

Every hormone test in this category is run from a standard blood sample. Saliva and urine methods exist and are used in some settings, but blood is the sample type behind most clinical laboratory methods and the one clinicians are most used to reading. Using a single sample type also keeps your results comparable over time.

You order online, then visit a Quest patient service center for the draw — and the collection takes a few minutes. Celio Health includes the physician's order each test requires, so there is no separate doctor's visit to arrange and no insurance to bill. Results are emailed to you securely as a PDF, so you can review them privately and bring them to a clinician who can interpret them against your symptoms, medications, and history.