Follicle-Stimulating Hormone (FSH) Levels Test
The FSH levels test is a blood test used to measure the amount of follicle-stimulating hormone (FSH) in the blood. FSH is a hormone produced by the pituitary gland, which is located at the base of the brain.
Purpose of the Test
The FSH levels test is used to:
- Diagnose and evaluate infertility in women
- Evaluate menstrual disorders, such as irregular periods or amenorrhea (absence of menstruation)
- Assess ovarian function and reserve in women
- Diagnose and monitor conditions such as polycystic ovary syndrome (PCOS) and premature ovarian failure (POF)
- Evaluate testicular function in men
- Diagnose and monitor conditions such as hypogonadism (low sex hormone production) and pituitary gland disorders
How the Test is Performed
A blood sample is taken from a vein in the arm, usually in the morning. The blood sample is then sent to a laboratory for analysis.
Interpretation of Results
The normal range for FSH levels varies depending on age, sex, and the laboratory conducting the test. In general:
- In premenopausal women, normal FSH levels are typically between 1.4 and 9.6 IU/L
- In postmenopausal women, normal FSH levels are typically above 30 IU/L
- In men, normal FSH levels are typically between 1.5 and 12.5 IU/L
Abnormal results may indicate:
- Infertility or reduced fertility
- Ovarian dysfunction or failure
- Pituitary gland disorders
- Hypogonadism (low sex hormone production)
- Polycystic ovary syndrome (PCOS) or other hormonal imbalances
Risks and Limitations
The FSH levels test is a relatively safe and simple procedure. However, as with any blood test, there may be some risks and limitations, including:
- Bleeding or bruising at the needle site
- Infection or inflammation at the needle site
- False or inaccurate results due to laboratory error or interference from other medications or medical conditions
Additional Testing
Depending on the results of the FSH levels test, additional testing may be recommended to further evaluate and diagnose any underlying conditions. This may include:
- Luteinizing hormone (LH) levels test
- Estradiol (E2) levels test
- Thyroid function tests
- Prolactin levels test
- Imaging studies, such as ultrasound or MRI
Article last updated on: 15th June 2025.
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