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Follicle Stimulating Hormone (FSH) Unit Converter
Follicle Stimulating Hormone (FSH) is a gonadotropin hormone produced and released by the anterior pituitary gland, acting as the primary driver of reproductive function. In women, FSH stimulates the growth of ovarian follicles and regulates estrogen production. In men, it is essential for stimulating Sertoli cells, which support spermatogenesis.
Clinically, FSH levels are measured to assess **fertility potential**, pinpoint the cause of menstrual abnormalities, and confirm the onset of menopause (where FSH levels surge). It is always interpreted alongside Luteinizing Hormone (LH), with the LH/FSH ratio being key to diagnosing conditions like Polycystic Ovary Syndrome (PCOS). Results are reported in International Units (IU/L or mIU/mL).
SI Units
RecommendedInternational Units per liter (Numerically 1:1).
Other Activity Units
Clinical Context
Reference Ranges (Women):
In both sexes, a high FSH level combined with a low or normal LH level suggests **primary gonadal failure** (ovaries or testes are failing). The numerical equivalence holds true because 1 Liter (L) contains 1000 milliliters (mL), and 1 International Unit (IU) contains 1000 milli-International Units (mIU).
Clinical References
How to Use This Calculator
Follow these steps to get accurate clinical conversions instantly.
Enter Values
Input your laboratory results into the corresponding unit field (e.g., IU/L). You can use either dot or comma decimals.
Automatic Conversion
The calculator works in real-time. Since 1 mIU/mL equals 1 IU/L, the conversions are instant and linear.
Verify Units
Check the SI Units section. IU/L and mIU/mL should always be numerically identical.
Reset
Use the Clear button to reset all fields before starting a new calculation.
Frequently Asked Questions & Tips
Yes. Milliliters (mL) are 1000x smaller than liters (L), but milli-International Units (mIU) are 1000x smaller than International Units (IU). These effects cancel out, making the concentrations numerically identical.
FSH is a glycoprotein, meaning its mass (e.g., ng/mL) can vary due to different carbohydrate chains, while its biological activity (IU/L) remains the clinically relevant standard.