In short
- LH (luteinising hormone) is a hormone that plays an important role in fertility and reproduction in both women and men.
- In women, a rapid increase in LH triggers ovulation and supports the menstrual cycle.
- In men, LH stimulates the production of testosterone in the testicles.
- A high or low LH value can be associated with changes in hormone balance, the menstrual cycle or fertility.
- LH levels can vary significantly in women throughout the menstrual cycle, making the timing of testing important.
- A finger prick blood test can measure the amount of LH in the blood and provide more insight into your hormonal balance.
- During fertility testing, LH is often assessed together with other hormones, such as FSH and estradiol.
- Would you like more insight into your menstrual cycle, hormone balance or fertility? An LH test can provide valuable information.
What is luteinising hormone and what role does this hormone play in the body?
Luteinising hormone, often abbreviated as LH, is a hormone produced by the pituitary gland, a small gland in the brain. LH plays an important role in reproduction. In women, LH triggers ovulation during the menstrual cycle: the moment when an egg is released from the ovary. In men, LH stimulates the testicles to produce testosterone, which is important for sperm production.
What does a high or low luteinising hormone value mean?
A high LH value may indicate that there is a problem with the ovaries or testicles, or that there is an imbalance in the body’s hormones. In women, it may, for example, indicate polycystic ovary syndrome (PCOS), a condition in which ovulation often does not occur. A low LH value may mean that the pituitary gland is not functioning properly or that there are other hormonal problems. This can affect fertility.
What symptoms can be associated with an abnormal luteinising hormone value?
Symptoms associated with an abnormal LH value include irregular periods or the absence of menstruation in women. Difficulty becoming pregnant can also be a sign. In men, an abnormal LH value may cause a lower libido, reduced muscle mass or problems with sperm production. Sometimes there are no obvious symptoms, but it is discovered during fertility testing.
What effect does luteinising hormone have on the menstrual cycle and fertility?
LH is essential for a normal menstrual cycle. Around the middle of the cycle, LH levels rise sharply, triggering ovulation. Without this surge, ovulation does not occur and pregnancy is not possible. In men, LH is needed for testosterone production, which is important for creating healthy sperm cells. An abnormal LH value can therefore lead to fertility problems in both women and men.
What can cause luteinising hormone levels to be elevated or reduced?
An elevated LH value can be caused by conditions such as PCOS, premature menopause or problems with the ovaries or testicles. LH levels are also often higher in women during menopause. A reduced LH value can occur due to problems with the pituitary gland or hypothalamus (parts of the brain that regulate hormones), being significantly underweight, stress or intensive exercise.
When is it advisable to measure luteinising hormone?
It is advisable to measure LH if you experience irregular periods, absence of menstruation or difficulty becoming pregnant. It can also be useful in men with fertility problems or a low libido. Sometimes LH is measured when certain hormonal disorders are suspected.
How is luteinising hormone measured and how do you interpret the result?
LH is measured using a finger prick blood test. The result is compared with normal values, which can vary between men and women and depend on age and the phase of the menstrual cycle. Your doctor will explain the result in combination with other symptoms and tests. A single abnormal result does not always provide a complete picture; sometimes multiple measurements are needed.
How can an abnormal luteinising hormone value be treated or improved?
Treatment depends on the underlying cause. Sometimes no treatment is needed, for example if there is a temporary hormonal disturbance. If there is an underlying condition, such as PCOS or a problem with the pituitary gland, your doctor will treat this condition. For people with a desire to have children, hormone treatments or fertility treatments may be used. A healthy lifestyle, sufficient nutrition, reducing stress and maintaining a healthy weight can also contribute to a better hormone balance. Always discuss with your doctor what is best for your situation.
This information is for educational purposes only and does not replace advice from a doctor. If your symptoms persist or you are concerned, always contact your doctor.
