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Hormones

FSH (Follicle Stimulating Hormone)

Follicle-stimulating hormone (FSH) is a pituitary hormone that reflects reproductive and hormonal health in active individuals. Intense training could influence FSH levels through effects on the hypothalamic-pituitary axis. Your healthcare provider can help assess whether your training is affecting hormonal regulation.

Doctor's Assessment Included

Reference Ranges

See the value that applies to you:

Choose male or female — this range differs by sex.

Enter your age — this range changes with age.

This range also depends on context such as cycle phase or sample material; the highlighted rows apply to your group.

Your reference range
U/L
1,5 134,8 U/L
Reference ranges by group, in U/L
Male 1,5–12,4 U/L
1,5 12,4
Female · Follicular 3,5–12,5 U/L
3,5 12,5
Female · Ovulatory 4,7–21,5 U/L
4,7 21,5
Female · Luteal 1,7–7,7 U/L
1,7 7,7
Female · Postmenopausal 25,8–134,8 U/L
25,8 134,8
1,5 134,8 U/L

Bijsluiterwaarde: 5e-95e percentiel per subgroep (n = 319 mannen, mediaan 4,6; 376 folliculair, mediaan 6,9; 56 ovulatie, mediaan 12,3; 349 luteaal, mediaan 3,6; 181 postmenopauzaal, mediaan 67). Een hormoonreferentiewaarde is assay-specifiek; deze waarden gelden voor de Roche Elecsys-methode.

Source: Roche Diagnostics Reference population: Roche referentiecohort (Elecsys FSH bijsluiter)

Reference ranges may vary between laboratories. When you order a test, a BIG-registered doctor assesses your personal results in context. For treatment decisions, discuss your results with your GP.

Check your own value

What It Measures

This test measures the concentration of follicle-stimulating hormone in your blood. FSH is released by the pituitary gland and stimulates the ovaries to produce eggs or the testes to produce sperm. Your healthcare provider may interpret FSH alongside LH and sex hormones for context.

Why It Matters

For active individuals, FSH levels may reflect whether intense training is suppressing the reproductive axis. Low levels could suggest hypothalamic suppression from overtraining or energy deficiency. Monitoring FSH with your healthcare provider may help balance performance goals with long-term hormonal health.

When to Test

Your healthcare provider may recommend FSH testing when evaluating fertility, investigating irregular or absent menstrual periods, assessing menopausal status, or examining delayed puberty. For women, testing is typically performed early in the menstrual cycle. Consult your provider for timing advice.

Symptoms

Low Levels

Some people may experience irregular or absent menstrual periods, decreased libido, infertility, or delayed puberty when FSH levels are low. Fatigue and reduced body hair could also suggest insufficient FSH production. A healthcare provider can help determine the underlying cause.

High Levels

Elevated FSH levels may be associated with menopausal symptoms such as hot flashes and night sweats in women, or could suggest testicular dysfunction in men. High FSH may also indicate diminished ovarian reserve. Your healthcare provider can evaluate what elevated levels mean for your situation.

Recommendations

Male

If Low

Low FSH may indicate pituitary dysfunction or hypogonadism. Consult with an endocrinologist for evaluation of pituitary function.

If High

Elevated FSH may indicate primary testicular failure or Klinefelter syndrome. Consider genetic testing and consultation with a reproductive endocrinologist.

Female

If Low

Low FSH may indicate pituitary dysfunction, hypothalamic amenorrhea, or PCOS. Consult with a gynecologist or reproductive endocrinologist.

If High

High FSH may indicate diminished ovarian reserve, menopause, or premature ovarian failure. Consider fertility consultation if planning pregnancy.

Lifestyle Tips

Maintaining a healthy weight, managing stress, and ensuring adequate nutrition may support healthy pituitary function and FSH regulation. Avoiding excessive exercise that could disrupt hormonal balance is also important. Always discuss concerns about your reproductive health with your healthcare provider.

Frequently Asked Questions

What does FSH do?
FSH stimulates egg development in women and sperm production in men, playing a key reproductive role.
Can FSH indicate menopause?
Rising FSH levels may suggest approaching menopause. Your healthcare provider can help interpret your results.
When in my cycle should I test FSH?
FSH is typically tested on day 2-4 of your cycle. Consult your healthcare provider for personalised timing.

Test Products

This marker is included in the following test panels.

Whoop

A 44-biomarker comprehensive health panel inspired by WHOOP Advanced Labs — a deep look at metabolism, cardiovascular risk, hormones, liver, kidney and inflammation.

SHBG (Sex Hormone Binding Globulin) TSH (Thyroid Stimulating Hormone) ALT (Alanine Aminotransferase) LDL Cholesterol Cortisol DHEA-S Estradiol (E2) Free Testosterone FSH (Follicle Stimulating Hormone) LH (Luteinizing Hormone) Total Testosterone Bicarbonate Calcium Chloride Ferritin Iron (Serum) Magnesium Potassium Sodium Transferrin CRP (C-Reactive Protein) Homocysteine Glucose (Fasting) HbA1c (Glycated Hemoglobin) ApoB (Apolipoprotein B) HDL Cholesterol Omega-3 Index Total Cholesterol Albumin HOMA-IR ALP (Alkaline Phosphatase) AST (Aspartate Aminotransferase) Bilirubin (Total) Total Protein Urea (BUN) Creatinine Vitamin D (25-OH) eGFR (Estimated Glomerular Filtration Rate) Insulin (Fasting) Leukocyte Differential Transferrin Saturation Lipoprotein(a) Triglycerides Basic Blood Count
€499,-

FSH (Follicle Stimulating Hormone)

€25,-