What Is the FSH Test? + [Normal Range for Male & Females]
Fertility Treatment
The FSH test is one of the common procedures in identifying male and female fertility issues, and it is carried out by receiving a blood sample. There is a stimulating hormone in men's and women's reproductive systems called FSH (Follicle follicle-stimulating hormone), which primarily aids in the growth of ovarian follicles and the occurrence of the menstrual cycle in women's bodies. In addition, the FHS hormone and testosterone are required in the male body to maintain the number of sperm and the normal function of sperm. The FSH normal range differs according to the age and sex of people. In men, balanced FSH is between 1.4 to 15.4 mIU/mL, while normal FSH levels in females still menstruating ranges between 4.7 and 21.5 mIU/mL.
The FSH test allows the doctor to identify issues such as the causes of both male and female infertility, early puberty, low sperm counts in males, missing ovulation in women, etc. Since your hormonal condition affects the type of fertility treatment, you should know the FSH test's normal range, how it is performed, and how you can interpret its results.
What Is Follicle-Stimulating Hormone (FSH)?
FSH, also known as follicle-stimulating hormone, is one of the hormones produced by the pituitary gland in the brain, whose production and secretion are regulated by other hormones. In other words, the FSH hormone is regulated by a few hormones made by the hypothalamus, pituitary, and reproductive glands, like the testicles (in males) and ovaries (in women).
Gonadotropin-releasing hormone (GnRH), which triggers the production of FSH and LH (gonadotropins), should be included among the hormones the hypothalamus produces. On the other hand, follicle-stimulating hormone can impact both the ovaries' and testicles' function.
What Is the Normal Value of the FSH Test in Men and Women?
The FSH test normal range in men is approximately 1.5 to 12.4 IU/L; however, the normal FSH level in females is calculated based on the stage of the menstrual cycle at the time of the test, as follows:
- Follicular Phase: 3.5 to 12.5 IU / L
- Luteal Phase: 1.7 to 7.7 IU / L
- Ovulation Peak: 4.7 to 21.5 IU / L
- Postmenopausal: Period 25.8 to 134.8 IU / L
Serum FSH levels are measured through a blood test, and the normal range may vary depending on factors such as age, sex, menstrual cycle phase, and laboratory reference values. In females, FSH results should be interpreted according to the timing of the test during the menstrual cycle.
Normal FSH Levels by Age
FSH levels change quite a bit as we age, and the pattern looks different for men and women:
Men — FSH (mIU/mL) | Women — FSH (mIU/mL) | Age |
4–0 | 4–0 | Childhood (pre-puberty) |
10–0.3 | Gradually increasing | Puberty |
12.4–1.5 | 21.5–1.7 | 18–40 years |
(largely unchanged) 1.5–12.4 | Usually above 10, fluctuating | 40–50 years |
12.4–1.5 (may rise slightly) | 134.8–25.8 (postmenopausal in women) | Over 50 years |
What Does High or Low FSH Mean in Men
The FSH test in men is performed to evaluate hypogonadism, low sperm count, and testicular function. Abnormal FSH levels may indicate problems affecting sperm production or hormonal regulation.
High FSH levels in men may be associated with:
- Testicular dysfunction or absence of a testicle
- Klinefelter syndrome (a genetic condition caused by an extra X chromosome)
- Testicular damage caused by chemotherapy, radiation, or alcohol abuse
- Certain disorders affecting sperm production
Low FSH levels in men may be caused by:
- Reduced function of the pituitary gland or hypothalamus
- Impaired sperm production
- Pituitary or brain tumors
- Severe chronic stress
- Very low body weight
What Does High or Low FSH Mean in Women?
The FSH test in women is used to evaluate ovarian reserve, ovarian function, and fertility potential. As women age, ovarian reserve and egg quality naturally decrease, and FSH levels may increase.
A higher FSH level may indicate a reduced ovarian reserve and a lower chance of natural conception. In some cases, assisted reproductive treatments may be considered.
High FSH levels in women may be associated with:
- Menopause and menstrual irregularities
- Ovarian dysfunction or premature ovarian insufficiency
- Reduced egg production and ovarian reserve
- Turner syndrome (a genetic condition involving the absence or abnormality of one X chromosome)
- Sheehan syndrome or pituitary disorders
- Enzyme deficiencies
- Autoimmune diseases
- Ovarian damage caused by chemotherapy or radiotherapy
- Certain infections affecting ovarian function
Low FSH levels in women may be caused by:
- Reduced function of the pituitary gland or hypothalamus
- Disorders affecting FSH production
- Hypothalamic dysfunction (such as Kallmann syndrome)
- Anorexia nervosa
- Hemochromatosis
Preparations Required for The FSH Test
The most crucial step before having this test is to inform your doctor about all the medications you are taking, especially radioisotopes, as well as any current or potential pregnancies.
Be aware that medications including clomiphene, cimetidine, levodopa, and digitalis typically elevate FSH level, while anticonvulsants, birth control pills, hormones, phenothiazines, and multivitamins containing biotin or vitamin B7 decrease it.
Which Diseases Affect the Results of the FSH Test?
The following diseases might affect the results of an FSH test:
- Orchidectomy (surgical removal of the testicles);
- Anemia or sickle cell anemia;
- Gonad failure;
- Unusual vaginal bleeding;
- Pituitary tumor;
- Sex hormone tumor.
When Is an FSH Test Prescribed?
The FSH test is performed depending on the doctor's diagnosis. It may usually be prescribed under the following conditions:
- Clinical suspicion of hypothalamic or pituitary dysfunction symptoms;
- Clinical suspicion of premature or delayed puberty in children and adolescents;
- Observing female infertility issues, amenorrhea, or irregular periods;
- Reduced libido, low sperm count, and low muscle mass in men.
What Are the Main Reasons for FSH Testing in Women?
As previously stated, the FSH test has diverse applications in women and men. In women, it is typically performed in conjunction with full hormonal tests to examine the following issues:
- Identifying the cause of infertility and selecting the best course of action;
- Determining the cause of period irregularities, including short or extended bleeding periods and heavy or light bleeding;
- Investigating the kind and origin of ovarian dysfunction, particularly about egg growth and production;
- Identifying potential issues with the operation of brain glands like the hypothalamus and pituitary and starting treatment;
- Predicting the onset of menopause and attempting to delay early menopause.
What Are the Main Reasons for FSH Testing in Men?
Examining the following concerns and problems is the primary purpose for performing the FSH test on men:
- Reasons for the low sperm count in the semen sample (hormonal factors related to FSH);
- Examination of hypogonadism or gonad failure;
- Examining the way testicles work and looking for diseases that affect these glands, particularly testicular hormonal issues.
FSH Test for Menopause and Fertility
A woman's FSH test can estimate her level of fertility and menopause onset. Determining a woman's ovarian reserve—which refers to her reproductive potential given her age—is the most crucial task in the field. Ovarian reserve, which reveals how long a woman will have the opportunity of a healthy and safe pregnancy, genuinely reveals the quantity and quality of eggs in the ovary.
FSH tests are usually not required after menopause; however, if any symptoms are present, the doctor may recommend repeating this test several times to better understand the changes in FSH hormone levels.
FAQs About FSH Test
What is the FSH level during menopause?
If you missed your periods for a year and the results of your blood test have shown “FSH level above 30”, your menopause has begun.
What is the FSH test for?
An FSH test determines the amount of follicle-stimulating hormone in the blood. The pituitary gland produces this hormone, one of the most crucial elements influencing how the human reproductive system and sexual function develop. As a result, an imbalance in the FSH hormone affects male and female fertility in multiple ways.
What is a normal FSH level for getting pregnant?
The FSH is not the only hormone affecting fertility; women of reproductive age must have 4.7 to 21.5 mIU/mL of FSH in their blood when trying to conceive. It should be noted that the best FSH level for pregnancy is 10 mL.
What Are Normal FSH and LH Levels in Females?
Normal FSH and LH levels in females depend on age and the phase of the menstrual cycle when the test is performed. FSH is usually measured to evaluate ovarian reserve and fertility, while LH helps assess ovulation and hormonal balance. Since these hormones change throughout the cycle, results should be interpreted by a doctor based on the individual's condition and laboratory reference ranges.
What is the difference between LH and FSH?
Technically, FSH is a gonadotropin required for the normal function of ovaries and testicles. Hence, an abnormal level of this hormone results in low sex cells in both men and women. LH is a heterodimeric glycoprotein that works with FSH to mature the egg follicles, increase the progesterone level, and support the early stages of pregnancy.
What should I do before the FSH test?
There is nothing special to do before the FSH test. However, your doctor may ask you to stop taking certain medications or supplements a few days before the test.
When should an FSH test be done?
Women can take the FSH test on days 2, 3, or 4 of their menstrual cycle, but it is suggested that they take it on day 3.
Is FSH a fertility test?
This test assesses the level of follicle-stimulating hormone. The results show how many eggs are left in women’s ovaries and their chance of pregnancy—whether naturally or by ART methods. So, the FSH test is a fertility test.
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