FSH
FSH (follicle-stimulating hormone) is produced by the pituitary gland and plays a key role in reproductive function. In women, it stimulates egg growth; in men, it helps control sperm production.
Category: Hormones
Also known as: fsh, follicle stimulating hormone, follicle-stimulating hormone, follitropin
Reference range: 1.5–12.4 mIU/mL (Source: ABIM)
Standard unit: mIU/mL
High values may indicate
High FSH levels may indicate primary ovarian insufficiency or menopause in women, testicular failure in men, Turner syndrome, Klinefelter syndrome, or pituitary tumors.
Low values may indicate
Low FSH levels may indicate pituitary gland disorders, hypothalamic dysfunction, polycystic ovary syndrome (PCOS), severe stress, or use of hormonal contraceptives.
Frequently asked questions
- What is a normal FSH level?
- A typical reference range for FSH is 1.5–12.4 mIU/mL (source: ABIM). Reference ranges vary by laboratory, age, and sex, so always compare against the range on your own lab report.
- What units is FSH measured in?
- FSH is most commonly reported in mIU/mL. Labs in different countries may use other units — you can convert between them with BloodId's blood test unit converter.
- Where do FSH reference ranges come from?
- BloodId uses ABIM standard reference ranges and educational information from MedlinePlus (see our methodology). Reference ranges still vary by lab, age, and sex, so always compare against your own report.
- Can I track FSH over time?
- Yes. Upload results from any lab and BloodId charts your FSH over time against its reference range, so you can see whether the trend is rising, falling, or stable.