Testing for hormone panels has never been more accessible. It has also never been more misused. Today, anyone walking into a diagnostic centre can self-request a panel of fifteen hormones before seeing a doctor. The outcome is usually anxiety and confusion. This ends with a follow-up appointment where they often find out many of the results cannot be interpreted because the blood was drawn on the wrong day of the cycle or wrong time of the day.
As a biochemist working in clinical diagnostics, this is a pattern worth addressing directly. The issue is rarely a lack of testing, it is untargeted testing. If hormone testing is not timed appropriately, the results can’t be relied on, delaying the diagnosis.
Not all hormones need to be tested in every woman with every symptom. The relevant panel depends entirely on what the clinical picture is.
FSH (Follicle Stimulating Hormone) and LH (Luteinizing Hormone) assess the pituitary's communication with the ovaries.
FSH drives the growth of follicles and egg maturation. LH triggers the ovulation.
Elevated FSH in the early follicular phase suggests diminished ovarian reserve (quantity and quality of a woman’s remaining eggs).
An LH:FSH ratio above 2:1 is a classic finding in PCOS (now also referred to as PMOS in newer literature).
Optimum time for testing: Both must be drawn on Day 2 or Day 3 of the menstrual cycle.
Day 1 is the first day of true, continuous menstrual bleeding, not light spotting. If the bleeding starts in the night, count the next day as Day 1. Schedule your blood draw for the morning of Day 2 or Day 3 from that point.
Estradiol (E2):
One of the major reasons for testing estradiol is to understand the ovarian reserve when correlated with other hormones.
A high estradiol on Day 2 can artificially suppress FSH, masking a declining reserve.
Optimum time for testing: Day 2-3 along with FSH.
Progesterone testing is done on Day 21 of a 28-day cycle (or 7 days post-ovulation), to confirm whether ovulation occurred. A mid-luteal value above 30 nmol/L generally suggests ovulation; between 10–30 nmol/L needs to be repeated with attention to cycle timing.
Optimum time for testing: Day 21
TSH:
One should remember TSH is the first-line thyroid test and not a full thyroid panel.
fT4, fT3 is needed if TSH is abnormal.
Anti-TPO, anti-thyroglobulin antibodies and other specific tests should be reserved for specific clinical indications, not for routine screening.
A normal TSH excludes most common thyroid dysfunction in otherwise healthy adults.
Optimum time for testing: Any day, preferably fasting.
Also read: Are Home Thyroid Tests Accurate?
Prolactin:
Relevant when there is galactorrhoea, amenorrhoea with no other explanation, or suspected pituitary pathology.
Since prolactin is stress-sensitive, it may spike with physical discomfort, a difficult blood draw, or even the anxiety of a clinic visit.
A confirmatory repeat under fasting, rested conditions is mandatory before any clinical decision is made.
Optimum time for testing: Any day, preferably fasting.
Total and free testosterone, DHEAS, and 17-OHP are relevant in the workup of hyperandrogenism (acne, hirsutism, irregular cycles, PMOS). 17-OHP should be drawn in the early morning in the follicular phase.
AMH (Anti-Müllerian Hormone) is one of the most over-requested tests in outpatient women's health right now.
It can be drawn on any day of the cycle, and reflects ovarian reserve.
A study from Human Reproduction (2025) found that women who perceived their AMH as “low” experienced significant distress and altered their reproductive decision-making, even though AMH does not reliably predict natural fertility in women without infertility.
In a young woman with no fertility concerns, ordering it routinely generates anxiety it cannot clinically justify.
Optimum time for testing: Any day of the cycle
Fasting insulin and glucose:
Often overlooked in hormone panels, Fasting Insulin and Glucose are among the most important investigations in any woman presenting with PMOS features, weight gain, or irregular cycles.
Insulin resistance drives much of the hormonal dysregulation in these conditions and is directly actionable.
Up to 70% of women with PMOS have insulin resistance, which directly drives hormonal dysregulation, yet metabolic screening is routinely skipped.
A HOMA-IR (Homeostatic Model Assessment of Insulin Resistance) below 2.0 is generally considered normal; values above 2.5 are suggestive of insulin resistance, and above 3.0 indicate significant resistance requiring clinical attention. It can detect resistance before blood sugar levels show any obvious abnormality.
A HOMA-IR (Homeostatic Model Assessment of Insulin Resistance) below 2.0 is often considered within normal range, while values above 2.5 may suggest insulin resistance and values above 3.0 may indicate significant resistance requiring clinical attention. Exact cutoffs vary between laboratories and populations. HOMA-IR may detect insulin resistance before blood sugar levels show obvious abnormality.
Women aged 35–50 experiencing irregular cycles often assume hormone testing will clarify whether they are entering perimenopause. In practice, FSH and estradiol fluctuate so significantly from day to day during this transition that a single panel is rarely diagnostic. Perimenopause is primarily a clinical diagnosis, based on symptoms and menstrual pattern over time. Hormone levels can support the picture but should not be the sole basis for a conclusion.
A hormone result without clinical context is just a number. Reference ranges are population averages, they do not account for where a woman is in her cycle, whether she is on hormonal contraception, her sleep pattern the night before, or whether the sample was handled correctly. Interpretation always requires the full picture.
See a doctor promptly if you experience:
Complete absence of periods for three or more months outside pregnancy
Sudden onset of excess facial or body hair
Unexplained nipple discharge
Symptoms suggestive of thyroid disease (persistent fatigue, weight change, palpitations, cold intolerance)
Difficulty conceiving after 12 months of trying.
Safety Note Women with diabetes on medication, kidney disease, cardiovascular conditions, or those who are pregnant should not self-request or self-interpret hormone panels. Testing and interpretation of the results in these groups requires clinical supervision.
Can I get hormone tests done without a doctor's referral?
Most labs will accept self-referrals, but interpreting results without clinical context is unreliable and often misleading. A targeted request guided by symptoms is always preferable to a broad self-ordered panel.
Does hormonal contraception affect test results?
Yes, significantly. Combined oral contraceptive pills suppress LH, FSH, and testosterone. Ideally, hormone testing should be done after a wash-out period, discussing timing with your doctor.
My TSH is normal but I still have symptoms. Should I test more thyroid hormones?
A normal TSH reliably excludes most thyroid dysfunction. Additional thyroid tests are warranted only in specific situations, persistent symptoms with a borderline TSH, suspected autoimmune thyroid disease, or pregnancy planning.
What is the best time of day to get hormones tested?
Morning, fasting where required. Cortisol, prolactin, testosterone, and 17-OHP are particularly time-sensitive and should be drawn early in the day.
I got my AMH tested and it's low. Should I panic?
Not based on a single result alone. AMH requires interpretation alongside age, clinical history, and other ovarian reserve markers. A low AMH in a 38-year-old has different implications than in a 24-year-old.
I am in my 40s with irregular cycles. Should I get my hormones tested to check if I am in perimenopause?
Hormone testing during perimenopause is tricky, FSH and estradiol can swing dramatically from one cycle to the next, which means a single blood test can be misleading in either direction. Most clinicians diagnose perimenopause based on symptoms and menstrual history rather than a one-time panel. Testing can support the clinical picture, but it should not be used in isolation to confirm or rule out the transition.
Irregular Cycles / PMOS Workup
First-Line Tests: FSH, LH, Estradiol, Testosterone, TSH, Fasting Insulin
Optimal Lab Timing: Day 2–3 of cycle (Fasting morning preferred)
Suspected Ovulation Dysfunction
First-Line Tests: Mid-luteal Progesterone
Optimal Lab Timing: Day 21 (or 7 days post-ovulation)
Thyroid Symptoms
First-Line Tests: TSH (add fT4/fT3 only if TSH is abnormal)
Optimal Lab Timing: Any day
Hirsutism / Severe Acne
First-Line Tests: Total Testosterone, DHEAS, 17-OHP
Optimal Lab Timing: Early morning, follicular phase
Fertility Evaluation
First-Line Tests: AMH, FSH, LH, Estradiol
Optimal Lab Timing: AMH: Any day; Others: Day 2–3
Galactorrhoea / Amenorrhoea
First-Line Tests: Prolactin, TSH
Optimal Lab Timing: Fasting, rested condition
This article is for informational purposes only and does not substitute for individualised medical advice.
Copp, T., Peate, M., Lensen, S., Hammarberg, K., Simonis, M., Sandhu, S., Lieberman, D., & Vakkas, A. (2025). P-541 The psychosocial and behavioural consequences of anti-müllerian hormone (AMH) testing on women. Human Reproduction, 40(Supplement_1), deaf097.847. https://doi.org/10.1093/humrep/deaf097.847
Diamanti-Kandarakis, E., & Dunaif, A. (2012). Insulin resistance and the polycystic ovary syndrome revisited. Endocrine Reviews, 33(6), 981–1030. https://doi.org/10.1210/er.2011-1034
GPnotebook. (2026). Day 21 progesterone for ovulation. https://gpnotebook.com/pages/gynaecology/day-21-progesterone-for-ovulation
Joham, A. E., Ranasinha, S., Zoungas, S., Moran, L., & Teede, H. J. (2014). Gestational diabetes and type 2 diabetes in reproductive-aged women with polycystic ovary syndrome. Journal of Clinical Endocrinology & Metabolism, 99(3), E447–E452. https://doi.org/10.1210/jc.2013-2007
Lujan, M. E., Chizen, D. R., & Pierson, R. A. (2008). Diagnostic criteria for polycystic ovary syndrome: pitfalls and controversies. Journal of obstetrics and gynaecology Canada : JOGC = Journal d'obstetrique et gynecologie du Canada : JOGC, 30(8), 671–679. https://doi.org/10.1016/S1701-2163(16)32915-2
National Health Service. (2023). Thyroid function tests. https://www.nhs.uk/conditions/thyroid-tests/
Spital Clinic. (2026). Day 3 hormone blood tests: FSH, LH & estradiol. https://www.spitalclinic.com/articles/day-3-hormone-blood-tests-fsh-lh-estradiol
Teede, H. J., Bahri Khomami, M., Morman, R., et al. (2026). Polyendocrine metabolic ovarian syndrome, the new name for polycystic ovary syndrome: a multistep global consensus process. The Lancet. https://doi.org/10.1016/S0140-6736(26)00717-8
Wijeyaratne, C. N., Balen, A. H., Barth, J. H., & Belchetz, P. E. (2002). Clinical manifestations and insulin resistance (IR) in polycystic ovary syndrome (PCOS) among South Asians and Caucasians: Is there a difference? Clinical Endocrinology, 57(3), 343–350. https://doi.org/10.1046/j.1365-2265.2002.01603.x
Yildiz, B. O., Bolour, S., Woods, K., Moore, A., & Azziz, R. (2010). Visually scoring hirsutism. Human Reproduction Update, 16(1), 51–64.https://doi.org/10.1093/humupd/dmp024
