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Free Testosterone

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Free Testosterone, Bioavailable Testosterone, Serum Free Testosterone

  • Indications
  1. Total Testosterone decreased
  2. Altered sex-hormone binding globulin (SHBG)
    1. Low SHBG
      1. Obesity
      2. Type II Diabetes
      3. Hypothyroidism
    2. High SHBG
      1. Older age patient
  • Labs
  • Normal Levels
  1. Male: 100 to 680 pg/ml
  2. Female: 3 to 22 pg/ml
  • Labs
  • Calculation of Testosterone Free Index (TFI)
  1. TFI = (Total Testosterone / SHBG) x100