FSH LH Profile

This profile measures two key hormones produced by the pituitary gland, follicle-stimulating hormone (FSH) and luteinising hormone (LH). These hormones control the reproductive system in both men and women, and measuring them together gives useful insight into how well this system is working. Because FSH and LH act on the ovaries and testes, their levels can help investigate a range of reproductive and hormonal concerns.

What this profile measures

• Follicle-stimulating hormone (FSH): in women, it stimulates the ovaries to prepare an egg each cycle; in men, it supports sperm production. Its level gives insight into how the ovaries or testes are functioning
• Luteinising hormone (LH): in women, it triggers the release of an egg (ovulation); in men, it stimulates testosterone production. The balance between LH and FSH can help identify specific hormonal patterns

What it can help assess

• Investigating fertility concerns in both men and women
• Understanding irregular, absent, or changing periods in women
• Assessing the menopause transition, as FSH in particular rises around menopause
• Investigating conditions such as PCOS, where the balance between LH and FSH can be informative
• Assessing early or delayed puberty in younger patients, as part of a wider assessment

An important note on interpretation

FSH and LH are best understood together and in context. In women, levels change significantly across the menstrual cycle, so the timing of the test matters, and it is usually taken in the early part of the cycle. Results are also interpreted alongside other hormones, your symptoms, age, and medical history. Any abnormal result is best discussed with your GP or specialist, who can interpret it fully and advise on any further testing.

Why it matters

FSH and LH are central to reproductive health in both sexes, and measuring them provides valuable insight into fertility, the menstrual cycle, the menopause, and other hormonal conditions. Understanding these levels can be an important first step in investigating a wide range of reproductive and hormonal concerns.