{"id":"free-androgen-index","name":"Free Androgen Index (FAI)","shortName":"FAI","aliases":["Free Androgen Index","FAI","Free Testosterone Index","Androgen Free Index","T/SHBG Ratio x100","Índice de andrógenos libres","Calculated Free Androgen Index","cFAI"],"abbreviations":["FAI","cFAI"],"loinc":[{"code":"24125-7","primary":true}],"specimen":"calculated","units":[{"ucum":"{index}","display":"index (no unit)"}],"referenceRanges":[],"review":{"status":"ai-draft","label":"AI-drafted. Awaiting verification","lastReviewed":"2026-10-03"},"summary":"A calculated estimate of how much testosterone is free to act, found by dividing total testosterone by SHBG.","url":"https://bloodtesttracker.com/markers/free-androgen-index","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}