LH Blood Test

Luteinizing hormone, or LH, is a reproductive hormone made by the pituitary gland in your brain. In women, LH triggers ovulation, which is the release of a mature egg from the ovary each month. In men, LH stimulates testosterone production in the testes. This hormone works closely with follicle-stimulating hormone, or FSH, to keep your reproductive system running smoothly.

Testing LH helps evaluate fertility, menstrual cycle irregularities, and reproductive health in both sexes. Your LH levels change throughout the month if you menstruate, with a sharp spike midway through your cycle to release an egg. In men, levels stay more consistent. Measuring LH gives your doctor important information about whether your pituitary gland and reproductive organs are communicating properly.

• You are trying to conceive and want to understand your ovulation patterns
• Your menstrual periods are irregular, absent, or unpredictable
• You have symptoms of low testosterone such as fatigue or reduced muscle mass
• You are experiencing fertility challenges or difficulty getting pregnant
• You have signs of polycystic ovary syndrome such as acne or excess hair growth
• You want to confirm whether you are entering menopause
• You have unexplained weight gain or difficulty losing weight
• Your libido has decreased or you have erectile dysfunction

Low LH symptoms in women include irregular or absent menstrual periods, difficulty conceiving, reduced libido, hot flashes, vaginal dryness, and mood changes. Women with low LH may experience anovulation, meaning they do not release an egg each cycle. This can lead to infertility. In men, low LH can cause low testosterone levels, resulting in fatigue, reduced muscle mass, decreased sex drive, erectile dysfunction, and mood disturbances.

High LH symptoms vary by underlying cause. In women with polycystic ovary syndrome, elevated LH may contribute to irregular cycles, acne, excess facial or body hair, and difficulty losing weight. During menopause, naturally high LH accompanies hot flashes, night sweats, sleep disturbances, and vaginal dryness. In men, high LH often signals testicular failure. Symptoms include low testosterone despite the pituitary producing more LH to try to compensate.

Chronic stress disrupts the hypothalamic-pituitary-gonadal axis, which controls LH production. Extreme calorie restriction, excessive exercise, and rapid weight loss can all suppress LH levels. Obesity affects hormone balance by increasing insulin resistance and inflammation, which can alter LH secretion patterns. Poor sleep quality and insufficient rest interfere with the pituitary gland's natural hormone rhythms.

Certain medications affect LH levels, including birth control pills, hormone replacement therapy, and steroids. Environmental toxins and endocrine disruptors found in plastics and personal care products may interfere with hormone signaling. Alcohol consumption and smoking can negatively impact reproductive hormone production. Adequate nutrition, especially sufficient healthy fats and protein, supports healthy LH levels. Managing body composition and maintaining a healthy weight helps keep your reproductive hormones balanced.

• Maintain a healthy body weight through balanced nutrition and regular movement
• Eat adequate calories to support your activity level and avoid extreme restriction
• Prioritize 7 to 9 hours of quality sleep each night for hormone regulation
• Practice stress management techniques such as meditation, deep breathing, or yoga
• Include healthy fats in your diet from sources like avocados, nuts, and olive oil
• Reduce alcohol consumption and avoid smoking to support pituitary function
• Limit exposure to endocrine disruptors found in plastics and personal care products
• Avoid excessive exercise that may suppress reproductive hormone production
• Eat sufficient protein to support hormone synthesis and overall health
• Work with a healthcare provider to address underlying conditions affecting hormone balance