Female hormone panel: what each test means and why cycle day matters

A female hormone panel makes sense once you know which day of the cycle the blood was drawn. FSH, LH and estradiol are read in the first days of a period, progesterone a week before the next one, and AMH, testosterone, SHBG, prolactin and TSH on any day. The same estradiol of 250 pg/mL is expected around ovulation and would be a question on day 3.

The panel answers three different questions, and it helps to keep them apart. Some markers describe where you are in this month's cycle (FSH, LH, estradiol, progesterone). Some describe the background state of your ovaries and androgens (AMH, testosterone, SHBG). Two check for problems elsewhere that can stop periods or ovulation (prolactin and TSH). Each marker has its own full page; this guide reads them together.

What is on a female hormone panel?

Why does cycle day change the result?

In a menstruating woman, four of these hormones move several-fold within a single month. Estradiol climbs as a follicle grows, LH spikes for a day or two to release the egg, and progesterone rises only after ovulation and falls before the next period. Daily sampling across healthy cycles shows the pattern clearly once each cycle is lined up on its LH peak. ⁷ A reference range printed without a phase is close to useless for these four markers, which is why most labs print separate ranges for follicular, mid-cycle, luteal and postmenopausal samples.

What is a day 3 hormone test?

A day 3 test (any of days 2 to 4 counts) draws FSH and estradiol at the quietest point of the cycle, before a lead follicle has taken over. A raised day 3 FSH suggests the pituitary is pushing harder to recruit a follicle, which happens as egg supply falls. Estradiol is drawn at the same time because a high early estradiol can push FSH down and make it look normal. The American Society for Reproductive Medicine (ASRM) notes that a normal FSH with an estradiol above 60 to 80 pg/mL on those days can still fit reduced ovarian reserve. ¹

FSH also varies from one cycle to the next, so one day 3 FSH is a weak basis for any conclusion. In ASRM's words, "FSH levels have significant inter- and intra-cycle variability that limits the reliability of a single measurement." ¹ That is a large part of why AMH has replaced FSH as the main ovarian reserve test in fertility clinics.

Why day 21 progesterone really means 7 days before your period

Progesterone is the panel's ovulation check. After the egg is released, the empty follicle becomes the corpus luteum and makes progesterone for about two weeks. The level peaks roughly 7 days after ovulation, which is day 21 only in a 28-day cycle. In a 35-day cycle ovulation tends to happen near day 21, so a day 21 sample can come back low even when ovulation is on its way. Cutoffs vary between sources: a mid-luteal progesterone above about 3 to 5 ng/mL (about 10 to 16 nmol/L) is widely read as evidence that ovulation happened, and American Family Physician uses 5 ng/mL or more, drawn on day 21 of a 28-day cycle or about 7 days before the expected period. ⁸ A low value on the wrong day is a timing problem first, and a repeat timed to the next period is the usual fix.

What can a hormone panel tell you about fertility?

AMH is made by the small follicles waiting in the ovary, so it tracks how many are left. It stays relatively consistent within and between cycles and can be drawn on any day, which makes it more practical than FSH. ¹ Fertility clinics use it to predict how many eggs IVF drugs will retrieve. ASRM notes AMH may be lower in women using hormonal contraception, so a result taken on the pill should be read with that in mind. ¹

Markers of ovarian reserve do not predict current reproductive potential among women with unproven fertility.ASRM Practice Committee, Testing and interpreting measures of ovarian reserve, Fertil Steril 2020 ¹

That stat comes from a prospective study of 750 women aged 30 to 44 who had been trying to conceive for 3 months or less. Women with an AMH under 0.7 ng/mL conceived at about the same rate as women with a normal AMH, and a high FSH did not lower the odds either. ² The authors concluded the results do not support using AMH or FSH to judge natural fertility. ASRM reaches the same place from the wider evidence and adds that age is a much stronger predictor of reproductive success than ovarian reserve. ¹

• The panel can show whether ovulation happened in the cycle tested (progesterone), and whether something is blocking it (prolactin, TSH, very low FSH and LH, or the PCOS pattern).
• The panel can estimate egg supply relative to others of the same age (AMH, with day 3 FSH and estradiol), which matters for planning IVF or egg freezing.
• The panel cannot tell you whether you will conceive this year, cannot check the fallopian tubes, the uterus or sperm, and cannot date the menopause to a particular year.

What does a hormone blood test show in perimenopause and menopause?

During perimenopause, FSH and estradiol swing from cycle to cycle and even week to week. A high FSH in one month can be followed by a normal one the next, with estradiol sometimes higher than in younger years. For that reason NICE advises identifying perimenopause and menopause in otherwise healthy women aged 45 or over from symptoms and the pattern of periods, without laboratory tests, and says not to use AMH, inhibin, estradiol or ultrasound counts for this. ⁴ It suggests an FSH test only for women aged 40 to 45 with symptoms including a change in their cycle, and for women under 40 in whom menopause is suspected. ⁴ NICE also says not to use FSH to identify menopause in anyone on combined estrogen and progestogen contraception or high-dose progestogen. ⁴

The STRAW+10 staging system describes the transition by bleeding pattern first. The early transition starts when consecutive cycles differ in length by 7 days or more; the late transition starts with gaps of 60 days or more, when FSH drawn at random is often above 25 IU/L. ⁵ Menopause is dated in hindsight, 12 months after the final period, and from then on FSH and LH stay high while estradiol stays low.

What does a hormone panel show in PCOS?

The 2023 international PCOS guideline diagnoses PCOS in adults when two of three features are present: irregular or absent ovulation, clinical or biochemical high androgens, and polycystic ovaries on ultrasound or a raised AMH, once other causes are excluded. ³ The hormone panel supplies two of those pieces and the exclusions.

• Testosterone: the guideline names total and free testosterone (or the free androgen index, which uses SHBG) as the tests for biochemical high androgens, and asks labs to use LC-MS/MS, a mass-spectrometry method, because standard immunoassays are inaccurate at female levels. ³
• SHBG: often low in PCOS, because insulin resistance lowers it, so free testosterone can be high while total testosterone sits inside the range.
• If testosterone is normal, DHEA-S and androstenedione can be considered, though they are less specific. ³
• AMH: in adults a raised AMH can stand in for the ultrasound, but not alone as a single test, and the guideline says AMH should not yet be used this way in adolescents. ³
• LH: often raised relative to FSH in PCOS, but an LH-to-FSH ratio is not one of the guideline's diagnostic criteria.
• Exclusions: TSH for thyroid disease, prolactin for a pituitary cause, and 17-hydroxyprogesterone for non-classic congenital adrenal hyperplasia, which can look identical. ³

The pill changes this part of the panel. Combined oral contraceptives raise SHBG and suppress ovarian androgens, so testosterone measured on the pill can look normal in someone with PCOS. The guideline says androgen testing on the pill is unreliable and that, where a test is essential, the pill would need to have been stopped for at least 3 months. ³ Any such change is a decision for the prescriber, never a reason to stop contraception on your own.

How do testosterone and SHBG read together?

Most testosterone in the blood is bound to SHBG and is not free to act on hair follicles and skin. The same total testosterone can therefore mean different things: with a low SHBG more of it is free, and with a high SHBG less of it is. Estrogen-containing contraception, pregnancy and an overactive thyroid raise SHBG. Insulin resistance, higher body weight and an underactive thyroid lower it. That is why the free testosterone, or the free androgen index (total testosterone divided by SHBG, times 100), often says more than the total alone in a woman with symptoms.

Why are prolactin and TSH on a female hormone panel?

A high prolactin suppresses the signal from the brain that drives FSH and LH, so it can stop ovulation and periods. The Endocrine Society says one prolactin result is usually enough to establish the diagnosis when the sample was taken without excessive venipuncture stress, and it lists the common non-tumor causes to rule out first: medicines such as some antipsychotics and anti-nausea drugs, an underactive thyroid, kidney disease and pregnancy. ⁶ A mildly high prolactin with no symptoms is often macroprolactin, a large, mostly inactive form that a lab can check for. ⁶

TSH is on the panel because both an underactive and an overactive thyroid disturb cycles, and an underactive thyroid can raise prolactin. A raised TSH with a raised prolactin often settles once the thyroid is addressed, so the two are read side by side. The thyroid itself has its own guide: how to read your thyroid panel.

How to read your female hormone panel, step by step

1. 1Find the cycle day and what you were takingCount from the first day of full bleeding to the day of the draw. Note any pill, patch, ring, hormonal IUD, HRT, fertility drug or high-dose biotin, since each changes these numbers.
2. 2Read FSH, LH and estradiol as one groupOn days 2 to 5, a low estradiol with FSH and LH in single digits is the expected baseline. A high FSH, or a normal FSH with a high estradiol, is a reserve question to discuss. Very low FSH, LH and estradiol together suggest the brain signal is quiet, as with low body weight, heavy training or a pituitary issue.
3. 3Check progesterone against the next periodCount back from when the next period started. If the draw was about 7 days before it and progesterone was above about 3 to 5 ng/mL, ovulation very likely happened. If the timing was off, the low result says little.
4. 4Read testosterone with SHBGLook at free testosterone or the free androgen index beside the total, and note whether the lab used LC-MS/MS.
5. 5Look at prolactin and TSH as possible causesA raised prolactin or an abnormal TSH can explain missed periods or absent ovulation by itself, so these come before conclusions about the ovaries.
6. 6Read AMH on its own termsCompare it with age-specific values on the report. It speaks to egg numbers and IVF planning, not to the odds of conceiving naturally.
7. 7Treat one result as one snapshotHormones that move with the cycle need a repeat, timed correctly, before a single number is trusted. Bring the cycle dates to the appointment.

What else changes hormone test results?

• Hormonal contraception and HRT: they suppress FSH, LH and ovulation, raise SHBG, can lower AMH and make an FSH-based menopause reading unreliable. ^{1 4}
• Pregnancy and breastfeeding: estradiol and progesterone rise very high in pregnancy, and prolactin stays high while breastfeeding.
• High-dose biotin: it can distort many immunoassays, including estradiol, testosterone, FSH, LH and TSH, in either direction. The biotin guide explains the problem; tell the lab or clinician if you take it.
• Stress, sleep loss, illness, rapid weight loss and heavy endurance training: these can quiet FSH and LH and delay ovulation for a cycle or longer.
• The assay: estradiol and testosterone at female levels differ between analyzers, so a change of lab can look like a change in you. The guide to reference ranges covers why.

If you track your cycle, the ovulation calculator can help estimate when the mid-luteal draw falls. The single most useful thing to bring to an appointment is the date of the period before the test and the date of the period after it, because with those two dates every number on this panel becomes readable.

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