Luteinizing Hormone

Luteinizing Hormone

Luteinizing hormone (LH) helps regulate the reproductive systems of both men and women. In women, LH affects ovaries, and in men, it affects tests. The luteinizing hormone plays a vital role in fertility. In this blog post, we will discuss the production and function of the Luteinizing hormone in both male and female bodies and the symptoms of abnormal Luteinizing hormone production.
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Role of Luteinizing hormone (LH) in the human body

The function of luteinizing hormone in women

The LH hormone is vital in maintaining the menstrual cycle and supporting a healthy pregnancy.

Instructions for collection, handling, and transportation of samples:

The semen is a fluid that contains various secretions from the male reproductive organ. It also contains nutrients and enzymes. The table explains the normal composition of human semen:


Levels of LH are low throughout the menstrual cycle and sharply increase towards the end of the first half of the cycle to reach a peak and trigger Ovulation. A sudden increase in LH level is known as the LH surge in the blood and it triggers ovulation within 2-3 days. Once ovulation is triggered, fertility is at its highest, and after the peak, LH levels decrease again due to negative feedback from estrogen and progesterone secretion. After ovulation, LH levels will decrease regardless of whether fertilization has occurred or not.


LH hormone stimulates the corpus luteum in your ovaries to produce progesterone during the third or fourth week of your menstrual cycle. Progesterone supports early pregnancy.

The function of luteinizing hormone in men:

During puberty, the Luteinizing Hormone increases to stimulate sexual maturity. It helps boost testosterone production in men, leading to full sperm development and fertility throughout life.

Abnormal levels of LH hormone in males and Females

High LH in Women

If LH remains high through the menstrual cycle, it means no ovulation is occurring; this could be due to the natural process of menopause or a dysfunction of ovaries in younger individuals. Polycystic ovary syndrome (PCOS) is another condition associated with high LH levels, and it affects around 1 in 10 women worldwide. Whatever the condition, elevated LH causes infertility.

Low LH in Women

In the case of low LH levels, the ovarian disorder is secondary to scarcity of LH. Promoting healthy lifestyles and balanced nutrition helps prevent conditions such as anorexia or bulimia, fostering well-being by avoiding endocrine disruption. In the case of hypopituitarism, the pituitary gland fails to produce sufficient hormones, including LH.

High & low LH In Men

A testicular dysfunction due to cancer treatment with either chemotherapy or radiotherapy causes an elevation of LH due to cellular damage. Chronic kidney disease and renal failure have been linked to high LH concentrations due to secretory dysregulation. Excessive alcohol consumption, either acute or chronic, has also been associated with hypogonadism and increased LH.

Symptoms of abnormal levels of Luteinizing Hormones LH

Abnormal levels of luteinizing hormones can result in various symptoms in the human body. These symptoms may include:
High LH In Women

Irregular Periods

High or low levels of luteinizing hormones can cause irregular or absent periods in women.
Low LH In Women

Fertility issues

LH level imbalances can affect fertility, causing problems with conceiving
High and low LH in men

General symptoms

Fatigue, unexplained weight loss, weakness, and reduced appetite may be linked to hormonal imbalances, including abnormal levels of LH.

Standard test to check Luteinizing Hormone (LH) Levels:

The most common method for measuring Luteinizing Hormone (LH) levels is through a blood test. A blood sample is usually taken from a vein in your arm and then sent to a laboratory for analysis. The Australian Concept LH hormone test is recommended on the 2nd or 3rd day of menses to assess reproductive health or to investigate issues related to infertility. The normal LH (luteinizing hormone) levels in the human body depend on several factors, including age and sex.
In women, the normal LH ranges are :
Normal ranges for LH hormone in males :

Treatment of Luteinizing Hormone Deficiency

There are multiple ways to increase LH; it may include hormonal replacement therapy (HRT). Infertility in both men and women can be managed with gonadotropin therapy, which may complement other procedures assisting fertility, like intrauterine insemination (IUI) or in-vitro fertilization (IVF).
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The luteinizing hormone is one of the two main gonadotropin hormones whose functions are to induce puberty and sexual maturation and maintain fertility in both men and women. The natural course of LH secretion in healthy individuals is an increase during puberty, then homeostasis throughout adulthood or until menopause is reached. Certain conditions specific to age and gender will either cause a surplus or a deficiency in LH, resulting in infertility. The treatment of LH level fluctuations will depend on the underlying cause.

FAQ's Related to Luteinizing Hormone

What is Luteinizing Hormone (LH)?

Luteinizing hormone (LH) is produced by the anterior pituitary gland. It plays a crucial role in regulating the reproductive systems of both men and women by influencing the production of sex hormones such as progesterone, estrogen, and testosterone.

How is LH produced in the body?

LH is produced by the anterior pituitary gland in response to gonadotropin-releasing hormone (GnRH) released by the hypothalamus. It acts on the gonads (ovaries in females and testes in males) to stimulate the production of sex hormones.

How are LH levels tested?

The most common method for measuring LH levels is through a blood test. This involves taking a blood sample from a vein in the arm and sending it to a laboratory for analysis.

LH testing is often recommended on the 2nd or 3rd day of menses to assess reproductive health or investigate issues related to the menstrual cycle, fertility, or hormonal imbalances.

How is Luteinizing Hormone Deficiency treated?

Treatment may involve directly targeting LH levels or addressing underlying causes. Gonadotropin therapy is one approach for managing infertility in both men and women.

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