Luteinising Hormone (LH)
Luteinising Hormone (LH) is a key reproductive hormone produced by the pituitary gland, located at the base of the brain. It plays a central role in regulating the function of the ovaries in women and the testes in men. LH works closely with other hormones, particularly follicle-stimulating hormone (FSH), to control reproductive processes, including ovulation, menstrual cycle regulation, and testosterone production.
In women, LH is responsible for triggering ovulation—the release of an egg from the ovary. During the menstrual cycle, LH levels rise sharply in what is known as the “LH surge,” which signals that ovulation is about to occur. This makes LH testing particularly useful in fertility assessments and cycle tracking.
In men, LH stimulates the Leydig cells in the testes to produce testosterone, a hormone essential for sperm production, muscle development, and overall male reproductive health. Measuring LH levels can therefore provide valuable insight into hormonal balance and reproductive function in both sexes.
Because LH interacts with multiple endocrine pathways, it is often assessed alongside other hormones such as FSH, oestradiol, testosterone, and prolactin. Together, these markers help build a comprehensive picture of hormonal health and reproductive status.
- Price: £50
- Code: LH
- TAT: 1 - 2 Working Days
- Sample Type: Blood
Clinical Significance
Abnormal LH levels can indicate a range of hormonal and reproductive conditions. In women, elevated LH levels may be associated with conditions such as polycystic ovary syndrome (PCOS) or primary ovarian insufficiency, where the ovaries do not function normally. Low LH levels, on the other hand, may suggest pituitary dysfunction or hypothalamic suppression, which can affect ovulation and fertility.
LH testing is commonly used in fertility investigations. By tracking LH levels, clinicians can determine whether ovulation is occurring and whether the timing of ovulation is appropriate. This is particularly useful for individuals trying to conceive or undergoing fertility treatments.
In men, abnormal LH levels can help distinguish between primary and secondary causes of low testosterone. Elevated LH with low testosterone may indicate a problem within the testes, whereas low LH and low testosterone may suggest an issue with the pituitary gland or hypothalamus.
LH levels may also change in response to age, stress, weight fluctuations, and certain medical conditions. Because of this, interpretation requires careful consideration of the individual’s clinical context, including symptoms, medical history, and other hormone levels.
Who Should Consider This Test?
The LH test may be recommended for individuals experiencing symptoms of hormonal imbalance or reproductive dysfunction. In women, this may include irregular menstrual cycles, difficulty conceiving, absence of ovulation, or symptoms suggestive of menopause.
It is also commonly used in fertility assessments, either as part of routine evaluation or in conjunction with ovulation tracking. Women undergoing assisted reproductive treatments may have LH levels monitored to optimise timing and improve outcomes.
In men, LH testing may be indicated for symptoms such as reduced libido, fatigue, infertility, or suspected low testosterone levels. The test helps identify whether the underlying issue originates from the testes or from hormonal signalling pathways in the brain.
In adolescents, LH testing may be used to evaluate early or delayed puberty, providing insight into developmental timing and hormonal progression.
Sample Collection
This test requires a blood sample, collected by a trained healthcare professional using standard techniques. The procedure is quick and minimally invasive, typically completed within a few minutes.
For women, the timing of the test within the menstrual cycle can be important, as LH levels fluctuate throughout the cycle. Healthcare providers may advise on the most appropriate timing depending on the purpose of the test, such as fertility assessment or hormonal evaluation.
The sample is processed using specialised laboratory methods to measure circulating LH levels with precision. Careful handling ensures that results accurately reflect hormonal status at the time of collection.
Understanding Your Results
LH results are interpreted in relation to age, sex, and, in women, the phase of the menstrual cycle. Because LH levels naturally fluctuate, a single result is often considered alongside other hormone measurements and clinical information.
In women, a mid-cycle rise in LH typically indicates ovulation, while persistently elevated or low levels may suggest underlying hormonal imbalance. In men, LH levels are assessed in conjunction with testosterone to determine whether hormonal production is functioning normally.
Abnormal results may prompt further testing to investigate pituitary function, ovarian or testicular health, or broader endocrine conditions. Healthcare professionals use LH results as part of a comprehensive evaluation rather than in isolation.
FAQs
When will I receive my results?
Results are usually available within the stated turnaround time.
Should I discuss my results with a doctor?
Yes, results should always be reviewed with a qualified healthcare professional.
Why Choose Marylebone Diagnostic Centre?
Marylebone Diagnostic Centre offers comprehensive hormonal testing in a professional and patient-focused environment. Our approach ensures that each test is performed with attention to detail, providing reliable and clinically meaningful results.
With fast turnaround times and experienced healthcare staff, we aim to make the testing process straightforward and efficient. Whether you are investigating fertility, hormonal imbalance, or general endocrine health, our services are designed to support accurate assessment and informed decision-making.
Book Now
Book the Luteinising Hormone (LH) test today to gain valuable insight into your reproductive hormone balance and overall endocrine health.
