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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
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