Hormone blood tests (fertility) (Reproductive hormone profile)
Blood tests, often timed to the menstrual cycle, that check whether you are ovulating and look for hormone problems that can affect fertility.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- Fertility hormone blood tests check whether you are ovulating and look for hormone problems such as thyroid or prolactin issues.
- Some tests must be timed to your cycle, such as a mid-luteal (day-21) progesterone to confirm ovulation and early-cycle FSH and LH.
- They can find treatable causes, but normal results do not rule out every cause of infertility or guarantee a pregnancy.
- Results need a clinician to interpret them in context; the right tests depend on your symptoms, your cycle and whether you are being investigated as a couple.
A plain-English summary. The detail — including risks and recovery — is below.
At a glance
A general guide. Your specialist will give you advice for your situation.
Can show whether you are ovulating, through a mid-luteal progesterone test.
Doing a panel of hormones with no plan to interpret them together.
Each blood test takes a few minutes. You can return to normal activity straight away, with at most a small bruise on your arm.
A clinician who interprets all the results together, in the context of your cycle and symptoms.
Each blood test takes a few minutes. You can return to normal activity straight away, with at most a small bruise...
You may need separate tests on different days, such as early-cycle FSH and a mid-luteal progesterone, so the full...
Each result comes back from the laboratory and is added to your record.
A clinician should explain the results together, whether they point to a treatable problem, and what, if anything...
What are fertility hormone blood tests?
Fertility hormone blood tests are a group of blood tests that look at the hormones controlling the menstrual cycle and ovulation. They help answer two main questions: are you releasing an egg each month (ovulating), and is there a hormone problem that could be affecting your fertility?
Some of these tests are timed to your cycle. A progesterone test taken about a week before your period is due, often called a 'day 21' or mid-luteal test, checks whether ovulation has happened. Early-cycle tests of FSH and LH, usually around days two to five, give information about how the ovaries and pituitary gland are working. Thyroid hormones and prolactin are often checked too, especially if periods are irregular, and testosterone and related hormones may be measured if there are signs of polycystic ovary syndrome.
These tests can find treatable problems, such as an ovulation disorder, a thyroid imbalance or a raised prolactin level. They are useful and often change management. But like all fertility tests, they cannot promise a pregnancy, and normal results do not rule out every cause of difficulty conceiving.
For men, hormone tests may be added if a semen analysis is abnormal, to look for a hormonal cause. In the UK, fertility investigations are guided by NICE, and treatment is regulated by the HFEA.
Types, options & approaches
There may be different ways to do this. The right approach depends on the clinical question and your circumstances.
When common fertility hormones are tested
| Hormone | When tested | Mainly checks |
|---|---|---|
| Progesterone | Mid-luteal (about day 21) | Whether you ovulated |
| FSH and LH | Early cycle (days 2 to 5) | Ovary and pituitary function |
| Thyroid and prolactin | Any day | Causes of irregular cycles |
| Testosterone | Any day, if PCOS suspected | Signs of PCOS |
Timing matters for some tests but not others. The right combination depends on your cycle, symptoms and what is being investigated, so a clinician should decide which tests you need.
Preparing for your test
- Ask which hormones are being tested and what each one is for.
- Find out which tests need to be timed to your cycle, and on which day, as progesterone in particular depends on this.
- Keep a note of your cycle dates, as the lab and clinician need to know where you are in your cycle.
- Tell the clinician about hormonal contraception, recent pregnancy or breastfeeding, which affect results.
- Mention all medicines and supplements, as some can change hormone levels.
- For some tests, the clinic may ask about timing of the sample during the day; check their instructions.
- Be prepared that you may need more than one test, or to repeat a test, before a clear picture emerges.
What happens
A health professional takes one or more small blood samples from a vein in your arm. Some samples must be taken on a particular day of your cycle, so you may be asked to book around your period, and you might need to come back for a separate test on another day.
For a mid-luteal progesterone, the sample is taken about seven days before your next period is expected, which is around day 21 in a 28-day cycle but is adjusted for longer or shorter cycles. Early-cycle FSH and LH are usually taken in the first few days of your period. Thyroid, prolactin and testosterone can usually be taken on any day.
The samples go to a laboratory and results are usually back within a few days to a week. A clinician should then explain what the results mean together, whether they point to a treatable problem, and what, if anything, should happen next.
Is this test right for me?
A good consultation should explore whether it's the right choice for you now — including reasons to wait or consider something else.
May not be suitable if…
- Doing a panel of hormones with no plan to interpret them together.
- Using a single hormone result to decide whether you can conceive.
- Testing progesterone on a fixed 'day 21' when your cycle is much longer or shorter, which can mislead.
- Relying on hormone tests alone when a tubal or sperm problem may be the issue.
Delay or rearrange if…
- A timed test, such as progesterone, cannot yet be taken on the right cycle day.
- You are on hormonal contraception that will distort the results, unless this is accounted for.
- You have recently been pregnant or are breastfeeding, which affects several hormones.
- You feel pressured into a panel of tests you do not understand.
Alternatives to discuss
- A focused single test, such as a progesterone to confirm ovulation, rather than a broad panel.
- Home ovulation tracking, such as ovulation predictor kits, in some situations.
- A specialist consultation first, to decide which hormones are worth testing.
- Seeing your GP for NHS investigation if you have been trying to conceive without success.
Before you decide
Use this as a shared-decision checklist. The aim is not just “can this be done?”, but whether it is right for you, now, with the risks and alternatives clearly understood.
What matters most to me?
Think about symptoms, daily life, work, caring responsibilities, sport, fertility, travel, appearance and anxiety — the right choice depends on your priorities, not just the medical facts.
What are all my options?
Ask about waiting, monitoring, medicines, rehabilitation, a smaller or larger procedure, a different test, NHS referral, or a second opinion where that would help.
What would make me pause?
Active infection, pregnancy, unstable medical problems, smoking, medicines that increase bleeding, poor support at home, or feeling pressured are all reasons to slow down and get tailored advice.
What happens if I do nothing today?
For some problems, waiting is safe; for others, delay can make treatment harder. A good consultation should explain the trade-off in plain English.
Benefits
- Can show whether you are ovulating, through a mid-luteal progesterone test.
- Can find treatable problems such as thyroid imbalance or a raised prolactin level.
- Can support a diagnosis such as PCOS or reduced ovarian reserve, alongside other tests.
- Help guide the right treatment, for example medicine to help ovulation.
- Are quick, low-risk and widely available.
Risks & complications
- Minor discomfort or a small bruise where blood is taken
- Needing the test repeated, or taken on a specific cycle day, before it is meaningful
- False reassurance from normal results, which do not rule out every cause of infertility
- A single result being misleading if taken at the wrong point in the cycle
- A borderline or unexpected result that leads to further tests
- An abnormal result, such as raised prolactin, that needs investigation of its cause
- Confusion if results are given without being interpreted together
- Fainting at the sight of blood or during the test
- Significant worry from results given without proper explanation or support
The main pitfalls with fertility hormone tests are timing and interpretation. A progesterone taken on the wrong day can wrongly suggest you are not ovulating, and isolated abnormal results can mislead if not put together. Ask the clinician how each test was timed, what the results mean as a whole, and what they would change because of them. An abnormal hormone, such as a high prolactin, may need its own investigation.
Published figures to discuss
Fertility hormone blood tests are low-risk, so they have no meaningful complication rate. The important uncertainty is timing and interpretation: a progesterone taken on the wrong cycle day, or an isolated abnormal value, can mislead. Because the right tests and their meaning depend so much on the individual and the cycle, reliable numerical 'accuracy' figures for the panel as a whole are not appropriate, and results should be read together by a specialist.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| Physical harm from blood tests | Very low | Brief pain, bruising or faintness are the usual risks. | NHS — Infertility: diagnosisnhs.ukSource-linked context |
| Wrong-cycle-day result | Common practical pitfall | FSH/LH/oestradiol, progesterone and other hormones are only meaningful when timed to the right cycle context. | Guide sourcesClinical context |
| False reassurance from normal hormones | Recognised | Normal hormones do not rule out tubal disease, endometriosis, sperm factors or age-related egg-quality decline. | Guide sourcesClinical context |
| False alarm from a single abnormal result | Recognised | Stress, illness, medicines, breastfeeding, contraception and lab variation can affect results. | Guide sourcesClinical context |
These are literature figures, not a personalised prediction. Your own risks and likely benefits depend on your circumstances, your health, and how your care is carried out and followed up.
What happens afterwards
There is no physical recovery from blood tests. The 'afterwards' is about waiting for results and then having them explained together, in the context of your cycle and symptoms.
- A small bruise or tenderness where blood was taken
- Needing more than one visit to complete cycle-timed tests
- A short wait for each result
- Being advised to repeat a test if timing or the result was unclear
Aftercare
- Ask for your results in writing, with the units and reference ranges.
- Make sure the results are explained together, not as isolated numbers.
- Check that cycle-timed tests, such as progesterone, were taken on the right day.
- Follow up any abnormal result, such as raised prolactin or a thyroid problem, as advised.
- If you have been trying to conceive, ask your GP about NHS investigations.
- Keep a copy of your results to share with your GP or another specialist.
- Written results with units and reference ranges
- A note of which cycle day each timed test was taken
- A clear explanation of what the results mean together
- A plan for any abnormal result that needs further tests
- Your GP informed if relevant
- Questions ready for any follow-up appointment
⚠ Get urgent help if…
- Periods that have stopped or become very irregular, which should be assessed
- Milk-like discharge from the nipples when not breastfeeding, which can suggest raised prolactin
- Symptoms of a thyroid problem, such as marked weight change, fatigue or a racing heart
- Feeling faint, dizzy or unwell during or after a blood test
- Feeling overwhelmed or distressed by results, when you should seek support
Who to contact: your clinician, clinic or test provider first (keep their number to hand). For urgent advice when you can't reach them, call NHS 111. In an emergency, call 999.
General guidance — it doesn't replace the specific advice your specialist gives you.
Results & realistic expectations
Each hormone is reported as a level with the laboratory's reference range. A raised mid-luteal progesterone suggests ovulation that cycle, while a low level may mean you did not ovulate, or that the test was taken on the wrong day. High FSH can point to reduced ovarian reserve, and abnormal thyroid or prolactin levels can disturb ovulation and may need treatment.
No single hormone result decides whether you can have a baby. Results are most useful read together, and even normal results do not rule out every cause of difficulty conceiving. A specialist should interpret the whole picture alongside your age, cycle and any symptoms.
Hormone results are a snapshot and can change from cycle to cycle and over time. A progesterone result applies only to that cycle. Tests may be repeated if results are unclear or if your situation changes, but repeating them often does not add much once a clear picture is reached. Your clinician should explain when a repeat is worthwhile.
Related tests, treatments or support
Fertility hormone tests are often done together as a panel, and combined with an AMH test, an antral follicle count scan and, for couples, a semen analysis. If you are being investigated for difficulty conceiving, a tubal patency test such as HyCoSy or HSG may also be arranged. A specialist should explain how all the results fit together.
Follow-up & long-term care
Your results should be discussed with a clinician who can interpret them as a whole. An abnormal result, such as a thyroid imbalance or raised prolactin, may need its own investigation and treatment. If everything is normal but you are struggling to conceive, you should still be offered further assessment, as normal hormones do not rule out every cause.
- Keep a record of your results and the cycle day each timed test was taken.
- Repeat tests only when a clinician advises it will change a decision.
- Continue treatment for any hormone problem, such as thyroid medicine, as directed.
- Review your plans with a clinician if your cycle or symptoms change.
Repeat, follow-on and what comes next
- A progesterone or other timed test is often repeated if the timing or result was unclear.
- Results can change between cycles, so a single set is a snapshot rather than the whole story.
- An abnormal result, such as raised prolactin, usually leads to its own further tests rather than being acted on alone.
Ask what happens if the result is unclear or needs repeating, and what is included if further tests or follow-up are needed.
What good aftercare looks like
- A clinician who interprets all the results together, in the context of your cycle and symptoms.
- Written results with units and reference ranges you can share with your GP.
- A clear plan for investigating any abnormal result.
- Onward referral or treatment where needed, without pressure to buy unnecessary tests.
What affects the cost
Costs vary a great deal between people and providers, and we don't publish prices. What matters is understanding what drives the cost and making sure your quote is complete. The main things that affect it:
- How many hormones are tested and whether several visits are needed for timed tests.
- Whether a specialist consultation to interpret the results is included.
- The laboratory and the specific assays used.
- Whether the tests are part of a wider fertility panel or assessment.
- Any follow-up tests needed if a result is abnormal, such as repeat thyroid or prolactin tests.
- Follow-up consultations and any onward referral or treatment.
- Which hormones the quoted price includes.
- Whether more than one visit is needed for cycle-timed tests, and whether each is charged.
- Whether a consultation to interpret the results is included.
- The cost of repeating or adding tests if a result is abnormal.
- Follow-up consultation costs after the results.
- What happens, and what it costs, if an abnormal result needs further investigation.
On the NHS? Fertility hormone blood tests are usually available on the NHS when fertility is being investigated. GPs often begin looking into fertility after about a year of trying, and sometimes sooner if you are older or there are other concerns, but the exact referral and eligibility rules vary between GP practices and NHS areas, and differ across England, Scotland, Wales and Northern Ireland. Check what applies to you with your GP or the relevant NHS or HSC fertility service. A self-requested panel outside NHS investigation is often private.
You're entitled to your total cost in writing — including reports, follow-up and what happens if the result is inconclusive — before you decide.
Consent traps and marketing red flags
These are not small details. They are often where patients lose choice, time to reflect, or realistic expectations.
Consent traps
- Being given numbers without an explanation of what they mean together.
- Not being told that normal hormones do not rule out every cause of infertility.
- A timed test taken on the wrong cycle day being treated as reliable.
- Being sold a large panel that is unlikely to change your management.
Marketing red flags
- Selling a broad 'hormone panel' as a complete fertility check.
- Implying normal hormones mean you can safely delay trying.
- Quoting results without units, reference ranges or interpretation.
- Using a single abnormal result to push treatment without proper investigation.
Choosing a specialist safely
- Check the specialist is on the GMC Specialist Register for this area.
- Make sure they work at a CQC-registered service, and look for membership of the relevant Royal College or professional body.
- You're entitled to time to consider and to have your questions answered before you agree — the specialist who looks after you should explain it, not a salesperson.
- Be wary of pressure: time-limited offers or deposits taken before you've had time to think are red flags, not bargains.
- You're entitled to your total cost in writing — including any follow-up — before you decide.
Questions to ask your medical professional
Take this to your consultation. A good specialist will welcome every one of these.
- Which hormones are you testing, and what is each one for?
- Which tests need to be timed to my cycle, and on which day?
- What do my results mean when read together?
- If a result is abnormal, what happens next?
- Do normal results rule anything out, and what do they not tell us?
- Should my partner be tested too?
- Are you on the GMC Specialist Register for this area, and which Royal College or professional body are you a member of?
- Will you be the specialist who carries out my test, and who looks after me afterwards?
- What are the risks for someone like me, and how often do your own patients have a problem or need it repeated or redone?
- What does a realistic result look like — and what can this test not achieve?
- What are my options, including waiting, doing nothing for now, or choosing a different approach?
- Can I have written information, results and aftercare instructions in a format I can use, including any accessibility or communication support I need?
- What is the total cost in writing, including any follow-ups, and how much time do I have to decide?
Frequently asked questions
Why do some tests have to be done on a certain day?
What is the 'day 21' progesterone test?
Do normal hormone results mean I can definitely conceive?
Are these tests available on the NHS?
Can my contraception affect the results?
Do men have fertility hormone tests too?
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How we made this page
Medically reviewed by a GMC-registered consultant. Written in plain English, checked against NHS, NICE, GMC and relevant Royal College / specialist-society guidance, and kept under review. No clinic paid to appear on this page, and we publish no pricing. This is general information to help you prepare — it is not a substitute for advice from your own clinician. How we review our guides →
Source hierarchy: UK regulator and NHS/NICE guidance first, then relevant Royal College or specialist-society guidance, then peer-reviewed evidence for procedure-specific figures where available.
Sources & standards: NHS — Infertility: diagnosis NICE NG257 — Fertility problems: investigation and management HFEA — A-Z fertility glossary (FSH and hormones) NHS — Polycystic ovary syndrome (diagnosis) British Fertility Society — patient information NHS inform (Scotland) — infertility NHS Wales — specialist fertility services commissioning policy (CP38) Northern Ireland — Regional Fertility Centre (Belfast HSC Trust)
Reviews reflect patients' experience of care, not clinical outcomes. For procedure volumes and outcome data see PHIN.
Last medically reviewed 2026-09-21. Spotted something wrong or out of date? Report an error in this guide.
Related guides: AMH blood test (ovarian reserve) · Antral follicle count (AFC) scan · Semen analysis · Fertility assessment (fertility MOT) · IVF