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    Glossary Free Androgen Index

    ratio estimating active testosterone in the bloodstream

    The Free Androgen Index (FAI) is a ratio used to estimate the amount of active, or "free," testosterone in the bloodstream. It is calculated by dividing the total testosterone level by the sex hormone-binding globulin (SHBG) level and then multiplying by 100. This index is particularly useful in diagnosing conditions related to hormonal imbalances, such as polycystic ovary syndrome (PCOS) and certain types of alopecia.

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    1. Defining hyperandrogenaemia according to the free androgen index in Chinese women: a cross-sectional study Clinical Endocrinology · 2012 · 19 citations
    2. Free androgen index (FAI)’s relations with oxidative stress and insulin resistance in polycystic ovary syndrome Scientific Reports · 2023 · 14 citations
    3. Vitamin B<sub>3</sub> (niacin), B<sub>6</sub>, C, and iron intake are associated with the free androgen index, especially in normoandrogenic polycystic ovary syndrome Journal of the Turkish-German Gynecological Association · 2022 · 10 citations
    4. The value of the free androgen index depends on the phenotype of polycystic ovary syndrome — a single-centre experience Endokrynologia Polska · 2019 · 7 citations
    5. The Diagnostic Value of Free Androgen Index in Obese Adolescent Females with Idiopathic Hirsutism and Polycystic Ovary Syndrome Journal of Academic Research in Medicine · 2021 · 5 citations
    6. Free Androgen Index (FAI): Marker of Premature Androgenetic Alopecia in Men Journal of Microbial & Biochemical Technology · 2016 · 1 citations
    7. Salivary Inflammatory Markers and Free Androgen Index in Women with Polycystic Ovary Syndrome: A Case-Control Study Journal of Obstetrics Gynecology and Cancer Research · 2026
    8. EXPRESS: Free androgen index and its relation with female pattern hair loss Journal of Investigative Medicine · 2025
    9. Correlation of clinical profile and anthropometry factors with free androgen index in evaluation of polycystic ovarian syndrome Indian Journal of Obstetrics and Gynecology Research · 2025
    10. Reduction in the Free Androgen Index in Overweight Women After Sixty Days of a Low Glycemic Diet Experimental and clinical endocrinology & diabetes · 2024
    11. Relationship Between Androgen Levels and Blood Pressure in Young Women With Polycystic Ovary Syndrome Hypertension · 2007 · 166 citations
    12. Increased androgen bioavailability is associated with non-alcoholic fatty liver disease in women with polycystic ovary syndrome Human Reproduction · 2009 · 119 citations
    13. Androgen Profile Through Life in Women With Polycystic Ovary Syndrome: A Nordic Multicenter Collaboration Study The Journal of Clinical Endocrinology and Metabolism · 2015 · 71 citations
    14. Growth hormone substitution in adult growth hormone‐deficient men augments androgen effects on the skin Clinical Endocrinology · 1997 · 55 citations
    15. PLASMA C19 STEROID SULPHATE LEVELS AND INDICES OF ANDROGEN BIOAVAILABILITY IN FEMALE PATTERN ANDROGENIC ALOPECIA Clinical Endocrinology · 1990 · 32 citations
    16. Effect of body mass index (BMI) on phenotypic features of polycystic ovary syndrome (PCOS) in Singapore women: a prospective cross-sectional study BMC women's health · 2021 · 24 citations
    17. Is it Necessary to Measure Free Testosterone to Assess Hyperandrogenemia in Women? The Role of Calculated Free and Bioavailable Testosterone Experimental and Clinical Endocrinology & Diabetes · 2006 · 22 citations
    18. Androgen profile in Chinese women with polycystic ovary syndrome in their reproductive years Reproductive Biomedicine Online · 2017 · 6 citations
    19. Diet‐Induced Obesity Promotes Alopecia Through Oxidative Stress and Androgen Signalling in Female Mice Experimental Dermatology · 2026
    20. THE EFFECT OF SPIRONOLACTONE ON HIRSUTISM AND FEMALE ANDROGEN METABOLISM Clinical endocrinology · 1985 · 32 citations
    21. Hair growth and androgen responses in hirsute women treated with continuous cyproterone acetate and cyclical ethinyl oestradiol European journal of endocrinology · 1987 · 9 citations
    22. Assessment of diagnostic competence of plasmatic androgens on polycystic ovary syndrome based on receiver operator characteristic curves Gynecological Endocrinology · 2010 · 8 citations
    23. A Prospective Study of the Prevalence of the Polycystic Ovary Syndrome in Unselected Caucasian Women from Spain1 The Journal of Clinical Endocrinology and Metabolism · 2000 · 491 citations
    24. A Prospective Study of the Prevalence of the Polycystic Ovary Syndrome in Unselected Caucasian Women from Spain The Journal of Clinical Endocrinology and Metabolism · 2000 · 298 citations
    25. Lifestyle changes in women with polycystic ovary syndrome Cochrane library · 2011 · 198 citations
    26. Prevalence of polycystic ovaries in women with androgenic alopecia European journal of endocrinology · 2003 · 84 citations
    27. Prevalence of polycystic ovaries in women with self-reported symptoms of oligomenorrhoea and/or hirsutism: Northern Finland Birth Cohort 1966 Study Human Reproduction · 2004 · 77 citations
    28. Receiver operating characteristic analysis of the performance of basal serum hormone profiles for the diagnosis of polycystic ovary syndrome in epidemiological studies European journal of endocrinology · 2001 · 66 citations
    29. Differential Expression of miR-93 and miR-21 in Granulosa Cells and Follicular Fluid of Polycystic Ovary Syndrome Associating with Different Phenotypes Scientific Reports · 2017 · 54 citations
    30. A Comparison of the Hormonal Profile of Early Androgenetic Alopecia in Men With the Phenotypic Equivalent of Polycystic Ovarian Syndrome in Women JAMA Dermatology · 2016 · 47 citations