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Free Androgen Index (FAI)
A calculated ratio derived from total testosterone and SHBG that estimates androgen status, most commonly used in women; it is not a direct measurement of free testosterone.
What is measured?
A calculated value derived from the component biomarkers named in this measure.
What the result represents?
Aden's range
What a raised or a low result can indicate
How Aden reads it as part of a system?
Aden reads this result alongside related sex hormones, SHBG, LH, FSH, prolactin, thyroid markers and your previous measurements. It is treated as one part of the wider hormonal picture, not as a diagnosis on its own.
What changes between tests?
Which related markers give it context?
related sex hormones, SHBG, LH, FSH, prolactin, thyroid markers
How to get this tested?
Evidence
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