LH and FSH tests

Overview

LH (luteinising hormone) and FSH (follicle-stimulating hormone) are two hormones made by the pituitary gland in the brain. These hormones help control the reproductive system. An LH and FSH test measures the level of these hormones in your blood. It is often used to check how well the ovaries or testicles are working, and to help diagnose fertility problems, early or late puberty, and other hormone-related conditions.

Yes, LH and FSH tests are very common blood tests. They are a standard part of fertility evaluations and are also used in children who are not going through puberty at the expected time.

The tests are used for people of all ages, but most often for women who are having trouble getting pregnant, men with low sperm counts, children who start puberty too early or too late, and adults with symptoms of menopause or low testosterone.

Symptoms

Common symptoms

• Irregular or absent menstrual periods
• Difficulty getting pregnant (infertility)
• Low sex drive (low libido) or erectile dysfunction in men
• Hot flushes, night sweats, or other menopause-like symptoms in women
• Early or delayed puberty in children

Symptoms in children

• No breast development by age 13 in girls, or no testicle growth by age 14 in boys (delayed puberty)
• Breast development or pubic hair before age 8 in girls, or testicle growth before age 9 in boys (early puberty)
• Slow growth or short stature

Symptoms in older adults

• Symptoms of menopause, such as hot flushes and vaginal dryness (common in women 45+ but can happen earlier)
• Low energy, reduced muscle mass, or mood changes that may suggest low testosterone in men

Causes

Main causes

• High LH and FSH levels can mean the ovaries or testicles are not responding to the hormones (e.g., menopause or testicular failure)
• Low LH and FSH levels can mean the pituitary gland or hypothalamus is not producing enough hormones (e.g., due to a tumor, stress, or medication)
• Abnormal levels may also be caused by eating disorders, excessive exercise, or certain genetic conditions

Risk factors

• Age (risk of menopause and age-related fertility decline)
• History of chemotherapy or radiation therapy to the pelvis
• Chronic stress or extreme weight loss
• Family history of early menopause or pituitary disorders

When to see a doctor

See a doctor urgently if:

• If you are experiencing sudden, severe pelvic or testicular pain
• If you have a very heavy or prolonged menstrual bleed

Book a routine appointment if:

• If you have been trying to get pregnant for a year (or 6 months if over 35) without success
• If you have irregular or no menstrual periods
• If your child is showing signs of puberty much earlier or later than expected
• If you have low sex drive, erectile dysfunction, or breast tenderness in men
• If you have menopausal symptoms before age 40

Diagnosis

An LH and FSH test is a simple blood test. A healthcare professional will take a small sample of blood from a vein in your arm. No special preparation is needed, though your doctor may want the test done on a specific day of your menstrual cycle if you are a woman.

Tests that may be done

• Blood test for LH and FSH levels
• May be repeated at different times (e.g., multiple days of the menstrual cycle) to see the pattern
• Often combined with other hormone tests like estrogen, testosterone, or prolactin

What to expect at your appointment

You may feel a quick sting when the needle goes in. The sample is sent to a lab and results usually come back in a few days to a week. Your doctor will review your results with you and explain what they mean for your health.

Treatment

Treatment depends on the reason for the abnormal hormone levels. It is never about treating the test result itself, but about treating the underlying condition that the test helped find.

Self-care at home

• Maintain a healthy weight – being very overweight or underweight can affect hormone levels
• Manage stress through relaxation techniques, yoga, or talking to a counselor
• Avoid excessive exercise, which can disrupt menstrual cycles

Medical treatments

If the results show a problem with the pituitary gland or hypothalamus, treatment may include hormone replacement therapy to bring LH and FSH levels back to normal. For women with menopause symptoms, hormone therapy can help. For men with low testosterone, hormone replacement may be considered. Fertility treatments, such as medications that stimulate ovulation, are also common. All treatments should be discussed with your doctor, who will choose the safest option for you.

When is surgery considered?

Surgery is rarely needed for hormone imbalances themselves. It may be considered if a pituitary tumor or other structural problem is found and does not respond to medication.

Living with this condition

Managing an underlying condition that causes abnormal LH and FSH levels often involves regular check-ups and sometimes medication. Many people live full, healthy lives with proper treatment.

Lifestyle tips

• Eat a balanced diet rich in fruits, vegetables, whole grains, and lean proteins
• Exercise regularly, but not to extremes
• Get enough sleep – aim for 7–9 hours per night

Diet and exercise

A healthy diet and moderate exercise help keep your hormones balanced. If you are trying to get pregnant, maintaining a healthy body weight is especially important.

Mental health and emotional wellbeing

Hormone imbalances can affect your mood, energy, and self-esteem. It is normal to feel frustrated or worried. Talking to a counsellor or a support group can help.

Prevention

Most causes of abnormal LH and FSH levels cannot be prevented, but maintaining a healthy lifestyle may help reduce the risk of some hormone imbalances. For example, avoiding extreme weight loss or gain and managing chronic stress can help keep hormones in a normal range.

Screening programmes

There is no routine screening for LH and FSH levels unless you have symptoms. If you have a family history of early menopause or pituitary disorders, talk to your doctor about whether testing might be useful.

Complications

If left untreated

• Continued infertility
• Osteoporosis (weak bones) due to low estrogen or testosterone over time
• Delayed or incomplete puberty in children
• Increased risk of heart disease or other health problems related to long-term hormone deficiency

Long-term outlook

With proper diagnosis and treatment, most hormone imbalances can be managed effectively. Many people go on to have children, resolve symptoms, and live healthy lives. Early detection through simple blood tests like LH and FSH helps improve outcomes.

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