Luteinizing Hormone (LH) Test

The luteinizing hormone (LH) is a hormone that plays a crucial role in reproductive health. This hormone is produced by the pituitary gland in the brain and stimulates the production of testosterone in men and progesterone in women. The LH test measures the amount of this hormone in the blood, which can help diagnose various conditions and monitor fertility treatments.

Why is the LH Test Important?

The LH test is primarily used to evaluate reproductive health in both men and women. In women, the LH test is often used to determine ovulation and fertility, as well as to monitor hormone replacement therapy. In men, the LH test is used to diagnose conditions such as hypogonadism, which is the failure of the testes to produce enough testosterone.

The LH test is also useful in monitoring fertility treatments, such as in vitro fertilization (IVF), where LH levels are closely monitored to determine the best time for egg retrieval.

What Happens During the LH Test?

The LH test is a simple blood test that can be performed at a doctor’s office or laboratory. The test requires a small sample of blood to be taken from a vein in the arm. Before the test, you may be instructed to fast for a certain period of time, as well as avoid certain medications that can affect LH levels.

After the blood is drawn, it is sent to a laboratory for analysis. Results are usually available within a few days, and your doctor will explain what the results mean in relation to your specific condition.

Normal Values of LH

The normal values of LH can vary depending on age, sex, and other factors. The table below provides an overview of the normal LH levels in adults:

Age Male Female
Prepubertal 0.1-1.0 mIU/mL 0.1-0.3 mIU/mL
Pubertal 0.3-3.0 mIU/mL 0.3-3.0 mIU/mL
Adult 1.5-9.3 mIU/mL 1.7-11.2 mIU/mL

Values outside these ranges may indicate a hormonal imbalance or other medical conditions that require further evaluation.

Q: What is the LH surge?
A: The LH surge is a sudden increase in LH levels that occurs just before ovulation in women. This surge triggers the release of an egg from the ovary, which is necessary for fertilization to occur.

Q: Can LH levels be affected by medications?
A: Yes, certain medications, such as hormonal contraceptives and fertility treatments, can affect LH levels. Your doctor will advise you on which medications to avoid before the LH test.

Q: What does it mean if my LH levels are high?
A: High LH levels can indicate conditions such as polycystic ovary syndrome (PCOS) in women or primary hypogonadism in men. Your doctor will interpret the results in the context of your specific symptoms and medical history.


The LH test is a simple and important tool in evaluating reproductive health in both men and women. By measuring LH levels in the blood, doctors can diagnose and monitor various conditions and fertility treatments. Normal LH values vary depending on age and sex, and values outside the normal range may indicate a hormonal imbalance or other medical conditions. If you have concerns about your reproductive health, speak to your doctor about the LH test and what it can tell you about your health.


American Association for Clinical Chemistry. (2021). Luteinizing Hormone (LH). Retrieved from

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