Hormone markers
LH Levels by Age: Why LH Steps Rather Than Drifts
Reviewed by a qualified clinician · analysed at UKAS-accredited UK labs (ISO 15189)
Last reviewed September 20268 min read
Every Helvy guide is written by our health editors, then checked by a qualified clinician before it goes live and re-checked as the science moves. We name clinical roles, not individuals, until each reviewer has agreed to be credited publicly. This is wellness guidance to help you understand your own data, not a diagnosis.
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There is no LH chart by age, because LH does not drift with the decades. It steps. One UK lab prints 1 to 8 IU/L for adult men, 1 to 12 across most of the menstrual cycle, and 16 to 66 after the menopause. Your life stage matters far more than your birthday.
Not sure which markers you need? Build your test →Your LH is 34. You are 51. The range on the report says 1 to 12, so the number is flagged, and the flag looks alarming.
It may well be the least alarming result on the page. LH behaves unlike most markers. It sits flat for thirty years, then moves in a single step. This guide covers where those steps fall, and what a high or low LH actually points to.
1. What is a normal LH level in the UK?
LH stands for luteinising hormone. Your pituitary gland makes it, and it is an instruction rather than a product. In women it triggers ovulation. In men it tells the testes to make testosterone.
Gloucestershire Hospitals NHS Foundation Trust sets out the chain of command in its pathology handbook:
“Synthesis and release of pituitary hormones luteinising hormone (LH) and follicle stimulating hormone (FSH) is under the control of gonadotrophin releasing hormone from the hypothalamus, and modulated by circulating gonadal steroids.”
Gloucestershire Hospitals NHS Foundation Trust, pathology handbook
The last six words carry the whole guide. Modulated by circulating gonadal steroids means LH rises when oestrogen or testosterone falls. LH is a thermostat reading, not a thermometer reading.
| Group | LH range |
|---|---|
| Adult male | 1 to 8 IU/L |
| Female, follicular phase | 1 to 12 IU/L |
| Female, ovulatory phase | 16 to 104 IU/L |
| Female, luteal phase | 1 to 12 IU/L |
| Post-menopausal | 16 to 66 IU/L |
Ranges differ between labs. North Bristol prints 1.2 to 8.6 IU/L for adult men and 19.2 to 103 IU/L at mid-cycle. York prints 7.7 to 58.5 IU/L after the menopause. Compare your number with the range beside it on your own report.
2. Is there an LH chart by age?
No, and there is a good reason. Age is the wrong axis for LH.
Markers like creatinine move gradually, so a chart by decade works. LH does not. For a woman it depends on where she is in her cycle, then changes category entirely at the menopause. For a man it holds steady for decades and then rises slowly.
So labs split LH by sex and life stage instead. That is the chart. It just is not laid out by birthday.
3. How does LH change with age in women?
In one big step, and it is the largest move any common hormone marker makes.
Through your reproductive years LH runs at roughly 1 to 12 IU/L for most of the month, with a sharp spike around ovulation that can reach 104. That spike is the signal that releases the egg. It lasts about a day, which is why the day you test decides what you see.
After the menopause the ovaries stop responding. Oestrogen falls, and the pituitary responds by shouting louder. LH settles into the 16 to 66 IU/L band and stays there. It is not a sign of damage. It is the expected reading once the feedback loop has no ovary at the other end.
| Stage | What to expect |
|---|---|
| Regular cycles | Low most days, with a one-day spike near ovulation. |
| Perimenopause | Erratic. Can read low one month and high the next. |
| Post-menopause | Settled high, commonly 16 to 66 IU/L, and it stays there. |
The perimenopause row is the one that trips people up. A single reading during those years tells you very little. FSH levels by age follows the same pattern and is usually read beside it.
4. Should you test LH to confirm the menopause?
If you are over 45 with typical symptoms, no. The same NHS pathology handbook is direct about it:
“The diagnosis in women over 45 years of age with typical menopause symptoms is clinical.”
Gloucestershire Hospitals NHS Foundation Trust, pathology handbook
Clinical means decided on symptoms and age, not on a blood result. The numbers swing too much month to month during the perimenopause to settle anything.
Under 45 it is a different question, and testing is more often considered. The same handbook also warns that FSH is of no value in women taking combined oestrogen and progestogen contraception, or high dose progestogen. If you are on the pill, the result will not mean what you think it means. The menopause hub covers what is worth measuring instead.
5. How does LH change with age in men?
Slowly upward, and for a reason worth understanding. The cells in the testes that make testosterone thin out with the decades. The pituitary compensates by sending more LH.
A 2019 review in Frontiers in Endocrinology reports that healthy older men carry about 40% less of that testosterone-making tissue than younger men, with a matching rise in LH. The authors describe what usually follows:
“In majority of healthy older men, the compensatory increase in gonadotrophins serves to maintain T levels within eugonadal ranges.”
Swee and Gan, Frontiers in Endocrinology, 2019
Eugonadal means a normal testosterone level. So the usual picture in an older man is a normal testosterone held up by a higher LH. The system is working harder to produce the same result.
That is why LH is so useful beside testosterone rather than alone. A man with low testosterone and a high LH has a different problem from a man with low testosterone and a low LH. Read it with testosterone levels by age.
6. What does a high LH result mean?
That the pituitary is pushing hard. The reason depends on who you are and what sits beside it.
- After the menopause, high LH is expected, not a finding.
- Mid-cycle, a high LH is the ovulation spike.
- In a man, a high LH with low testosterone points at the testes.
- A raised LH against FSH can feature in PCOS.
On that last point, the Gloucestershire handbook notes the LH to FSH ratio is often above 2.5 in polycystic ovary syndrome, though it can also be normal. Our guide to the normal LH to FSH ratio goes into how that is read.
7. What does a low LH result mean?
In a menstruating woman tested outside ovulation, usually nothing. Low is the normal state for most of the month.
It reads differently when the sex hormone beside it is also low. A low testosterone with a low LH suggests the signal is missing rather than the testes failing, and that shifts where a clinician looks next. Hormonal contraception, some medicines and a heavy training load can all suppress LH.
A low LH is rarely acted on by itself. It earns its meaning from the numbers printed around it.
8. Which blood test includes LH?
LH is almost never ordered alone. It travels with FSH, and usually with a sex hormone, because on its own it answers no question.
Helvy reports LH in two panels. The Hormone Balance panel pairs it with FSH, SHBG, total testosterone and free androgen index. Complete Male Hormones adds prolactin, DHEA-S, albumin and calculated free testosterone.
If you have a cycle, the day you give the sample matters more than the panel you pick. The normal LH levels guide sets out which day suits which question. For men, the men's hormones hub covers the wider picture.
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Frequently asked questions
What are normal LH levels by age in the UK?
UK labs split LH by sex and life stage rather than by age. One trust prints 1 to 8 IU/L for adult men, 1 to 12 IU/L in the follicular and luteal phases, 16 to 104 IU/L at ovulation, and 16 to 66 IU/L after the menopause.
What is a normal LH level for a woman over 50?
If she has been through the menopause, commonly 16 to 66 IU/L. A result in that band is the expected reading once the ovaries stop responding, not a sign that something is wrong. Some labs use a slightly wider band, such as 7.7 to 58.5 IU/L.
Does LH rise with age in men?
Gradually, yes. Healthy older men carry about 40% less testosterone-making tissue in the testes, and LH rises to compensate. A review in Frontiers in Endocrinology notes that in most healthy older men this keeps testosterone in the normal range.
Is a high LH always a problem?
No. After the menopause it is expected, and mid-cycle it is the ovulation spike. It reads differently in a man with low testosterone, where it points towards the testes rather than the pituitary. Context decides.
Can LH confirm that I am in the menopause?
Over 45 with typical symptoms, the diagnosis is clinical rather than a blood test, as Gloucestershire Hospitals NHS Foundation Trust states. Levels swing too much during the perimenopause for one reading to settle it. Under 45, testing is more often considered.
Does the pill affect LH and FSH results?
Yes. The same NHS handbook says FSH is of no value in women taking combined oestrogen and progestogen contraception, or high dose progestogen. Tell whoever orders the test what you take.
What day of my cycle should LH be tested?
It depends on the question. Day 2 to 5 is the usual window for a baseline reading. Testing near ovulation gives a much higher number, which is normal but not comparable with the baseline range.
Which Helvy test includes LH?
Hormone Balance reports LH with FSH, SHBG, total testosterone and free androgen index. Complete Male Hormones reports the same plus prolactin, DHEA-S, albumin and calculated free testosterone.