FSH Blood Test

Follicle-stimulating hormone, or FSH, is a reproductive hormone made by the pituitary gland in your brain. This hormone plays a key role in sexual development and fertility. In women, FSH helps regulate the menstrual cycle and tells the ovaries to grow eggs. In men, FSH is essential for making sperm.

FSH works as part of a feedback loop with your reproductive organs. When sex hormones like estrogen or testosterone are low, your pituitary releases more FSH to stimulate the ovaries or testes. When hormone levels are adequate, FSH production decreases. This balance is crucial for fertility and hormone health. FSH levels vary naturally throughout life and, in women, during the menstrual cycle. Levels are typically low before puberty, fluctuate during reproductive years, and rise significantly during menopause.

• Evaluate fertility issues or difficulty conceiving
• Check for menstrual irregularities or absent periods
• Confirm menopause or perimenopause status
• Assess pituitary gland function
• Diagnose primary ovarian insufficiency or poor ovarian reserve
• Evaluate testicular function and sperm production in men
• Investigate delayed puberty in adolescents
• Monitor treatment for hormonal conditions

High FSH symptoms vary by sex and cause. In women, elevated FSH often signals diminished ovarian function. Symptoms may include irregular or absent periods, hot flashes, night sweats, vaginal dryness, and difficulty conceiving. Mood changes and reduced libido are also common. In men, high FSH with low testosterone suggests testicular dysfunction. This may cause reduced fertility, low sperm count, decreased muscle mass, fatigue, and diminished sexual function.

Low FSH symptoms reflect inadequate signaling for reproductive function. Both men and women may experience infertility, delayed puberty in adolescents, decreased libido, and fatigue. Women may have absent or irregular periods and difficulty conceiving. Men may experience low testosterone symptoms including reduced facial and body hair, decreased muscle mass, erectile dysfunction, and low energy. Low FSH can also indicate pituitary or hypothalamic disorders affecting multiple hormone systems.

FSH levels can be affected by chronic stress, nutritional deficiencies, excessive exercise, and low body weight. Environmental toxins and endocrine disruptors found in plastics, pesticides, and personal care products can interfere with hormone balance. Certain medications including birth control pills, hormone therapy, and steroids can alter FSH levels. Age is a natural factor, with FSH rising during menopause in women and sometimes increasing with age in men.

Underlying health conditions like thyroid disorders, pituitary tumors, ovarian cysts, and testicular damage can affect FSH production. Alcohol consumption and smoking may also impact reproductive hormone levels. In women, FSH naturally fluctuates during the menstrual cycle, so timing of testing matters. Crash diets, eating disorders, and extreme calorie restriction can suppress FSH production.

• Maintain a healthy body weight through balanced nutrition
• Include adequate healthy fats in your diet to support hormone production
• Manage chronic stress through meditation, yoga, or deep breathing exercises
• Get 7 to 9 hours of quality sleep each night
• Avoid excessive exercise or overtraining that stresses the reproductive system
• Reduce exposure to endocrine disruptors in plastics and personal care products
• Limit alcohol consumption and avoid smoking
• Eat a nutrient-dense diet rich in vitamins D, B6, B12, and folate
• Include zinc and selenium through foods like nuts, seeds, and fish
• Address underlying thyroid or metabolic conditions with your healthcare provider
• Consider acupuncture or other stress-reducing therapies
• Avoid crash diets and extreme calorie restriction