FSHtasoja

FSHtasoja is the Finnish term used to refer to the concentration of follicle-stimulating hormone (FSH) in the bloodstream. The concept is used in clinical endocrinology and reproductive medicine to assess gonadal function and pituitary activity. FSH levels are measured from a blood sample using immunoassay methods and are expressed in international units per liter (IU/L) or milli-international units per milliliter (mIU/mL). Reference ranges vary by laboratory and depend on age, sex, and physiological state; thus single values require careful interpretation.

In women, FSH plays a key role in evaluating ovarian reserve and menopausal status. Levels tend to rise with diminishing ovarian function and are typically higher in perimenopause and postmenopause. In men, FSH supports spermatogenesis, and elevated levels can indicate testicular failure, while low levels may reflect pituitary or hypothalamic dysfunction.

Tests often accompany FSH with other hormones such as luteinizing hormone (LH), estradiol, and anti-Müllerian hormone (AMH) to give a fuller picture of reproductive status. FSH is regulated by gonadotropin-releasing hormone (GnRH) from the hypothalamus, and its interpretation must consider circadian variation, recent hormonal therapies, pregnancy, acute illness, and lifestyle factors.

Limitations include the possibility that a single measurement does not reflect long-term function. In many cases, doctors repeat testing or interpret FSH alongside clinical findings.