This version was machine-translated from German and has not been medically reviewed. The authoritative version is the German version.
Free androgen index (FAI)
Testosterone / SHBG × 100 – guide values for girls aged 12–21 years (< 3.45 healthy, > 6.15 suspected PCOS; Sağsak 2021)
Calculation aid for healthcare professionals: the calculator reproduces what the sources cited assign to the inputs. Clinical assessment and every treatment decision remain with the treating physician. Inputs and results are not stored.
Frequently asked questions
Free androgen index (FAI): What does this calculator compute?
Calculates the free androgen index from total testosterone (nmol/l or ng/dl) and SHBG (nmol/l) and compares it with the ROC cut-offs of a study in girls aged 12–21 years (Sağsak 2021: < 3.45 healthy, > 6.15 suspected PCOS); an international consensus cut-off for adolescents is lacking.
Free androgen index (FAI): Which sources is this calculator based on?
Carter GD, Holland SM, Alaghband-Zadeh J, Rayman G, Dorrington-Ward P, Wise PH: Investigation of hirsutism: testosterone is not enough (Ann Clin Biochem 20:262–263) (1983); Sağsak E, Keskin M, Çetinkaya S, Savaş Erdeve Ş, Aycan Z: The Diagnostic Value of Free Androgen Index in Obese Adolescent Females with Idiopathic Hirsutism and Polycystic Ovary Syndrome (J Acad Res Med 11:81–85) (2021)