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The follicle-stimulating hormone or FSH blood test measures the level of FSH in the blood. FSH is a hormone released by the pituitary gland in men and women and plays an essential role in reproduction. An FSH test is commonly used to assess fertility in both men and women, identify reproductive problems, and check ovarian function. In women, FSH levels can indicate whether they are nearing menopause, while in men, the test helps evaluate sperm production and testicular health.
Why is the Follicle Stimulating Hormone test prescribed?
The doctor recommends an FSH Test to check the cause of infertility, irregular menstruation, amenorrhea (Missing periods in women), to diagnose any dysfunction of ovaries or testicles, hypothalamic disorder, delayed or early puberty in children, low sperm count, and decreased libido.
Besides, women with PCOS often have hormonal imbalances, and measuring FSH levels can aid in identifying the condition. In most cases, FSH levels are lower because the imbalance interferes with normal ovulation. By assessing these levels, doctors can make a more accurate diagnosis of PCOS and recommend suitable treatment.
The main component doctors usually check in this test is the Follicle-stimulating hormone, which is secreted from the anterior pituitary gland in a pulsatile manner. This hormone is necessary for normal pubertal development and is responsible for fertility in both men and women.
Procedure and Prerequisite
A blood sample is taken from the vein. In a female patient, the sample is collected at specific times during her menstrual cycle. No need to fast. Sometimes a urine sample is also collected to check the FSH.
Reference range
Basal level in premenopausal women depends on age, smoking history, length, and menstrual cycle regularity.
Male 13-70 Years | 1.4- 18.1 IU/L |
Female Normally menstruating | |
Follicular Phase | 2.5-10.2 IU/L |
Midcycle Peak | 3.4- 33.4 IU/L |
Luteal Phase | 1.5-9.1 IU/L |
Pregnant | <0.3 IU/L |
Postmenopausal | 23.0 -116.3. IU/L |
These values are for theoretical reference and may vary from laboratory to laboratory and person to person.
Tanner Stage (FSH MIU/ML)
Males (MIU/ML) | 1- 0.4-3.0 |
Female (MIU/ML) | 1- 0.8-6.5 |
Follicle stimulating hormone is a gonadotropic hormone secreted by pituitary. Gland and responsible for developmental and reproductive processes of the body. Its diagnostic utility is for gonadal dysfunction and infertility work up. It is used as a medication in ovulation induction/ovarian hyperstimulation as part of IVF.
High level are seen in-
Menopause
Poor ovarian reserve
Turnover syndrome
Low level are seen in-
PCOS
Kallmann syndrome
Hypothalamic suppression
Hyperprolactemia
Frequently Asked Questions
How is the FSH test performed?
What is the normal range in FSH Test?
Does the FSH level affect pregnancy?