{"id":"testosterone-bioavailable","name":"Testosterone, Bioavailable","shortName":"Bioavailable T","aliases":["Bioavailable Testosterone","Testosterone, Free and Weakly Bound","Non-SHBG-Bound Testosterone","Bio-T","Bioavailable T","Testosterone, Bioavailable by Mass Spec","Free and Weakly Bound Testosterone","Non-SHBG-T"],"abbreviations":["Bio-T"],"loinc":[{"code":"2990-0","primary":true},{"code":"41018-3","primary":false},{"code":"51005-7","primary":false},{"code":"108779-0","primary":false}],"specimen":"serum","units":[{"ucum":"ng/dL","display":"ng/dL"},{"ucum":"nmol/L","display":"nmol/L"},{"ucum":"ng/mL","display":"ng/mL"},{"ucum":"pg/mL","display":"pg/mL"}],"referenceRanges":[{"population":"Men, 18+","low":131,"high":682,"unit":"ng/dL","unitDisplay":"ng/dL","note":"ARUP bioavailable testosterone calculated from immunoassay total testosterone, SHBG and binding constants, adults 18 and older. ARUP's mass-spectrometry version lists 130 to 680 ng/dL. For people on testosterone hormone therapy, ARUP says to use the male intervals. Ranges depend on the method, so compare only with a range for the same method.","sources":[{"title":"Testosterone, Bioavailable and Total, Includes Sex Hormone-Binding Globulin (Adult Males or Individuals on Testosterone Hormone Therapy) (test 0070102)","url":"https://ltd.aruplab.com/Tests/Pub/0070102","publisher":"ARUP Laboratories"},{"title":"Testosterone, Bioavailable and Total, Includes Sex Hormone-Binding Globulin (Adult Females, Children, or Individuals on Testosterone-Suppressing Hormone Therapy) (test 0081057)","url":"https://ltd.aruplab.com/Tests/Pub/0081057","publisher":"ARUP Laboratories"}]},{"population":"Women, 18–30","low":2.2,"high":20.6,"unit":"ng/dL","unitDisplay":"ng/dL","note":"ARUP bioavailable testosterone by mass spectrometry, calculated from LC-MS/MS total testosterone, SHBG and the binding constants. For people on testosterone-suppressing hormone therapy, ARUP says to use the female intervals. Compare only with a range for the same method. Women aged 18 to 30.","sources":[{"title":"Testosterone, Bioavailable and Total, Includes Sex Hormone-Binding Globulin (Adult Females, Children, or Individuals on Testosterone-Suppressing Hormone Therapy) (test 0081057)","url":"https://ltd.aruplab.com/Tests/Pub/0081057","publisher":"ARUP Laboratories"}]},{"population":"Women, 31–40","low":4.1,"high":25.5,"unit":"ng/dL","unitDisplay":"ng/dL","note":"ARUP bioavailable testosterone by mass spectrometry, calculated from LC-MS/MS total testosterone, SHBG and the binding constants. For people on testosterone-suppressing hormone therapy, ARUP says to use the female intervals. Compare only with a range for the same method. Women aged 31 to 40.","sources":[{"title":"Testosterone, Bioavailable and Total, Includes Sex Hormone-Binding Globulin (Adult Females, Children, or Individuals on Testosterone-Suppressing Hormone Therapy) (test 0081057)","url":"https://ltd.aruplab.com/Tests/Pub/0081057","publisher":"ARUP Laboratories"}]},{"population":"Women, 41–51","low":2.8,"high":16.5,"unit":"ng/dL","unitDisplay":"ng/dL","note":"ARUP bioavailable testosterone by mass spectrometry, calculated from LC-MS/MS total testosterone, SHBG and the binding constants. For people on testosterone-suppressing hormone therapy, ARUP says to use the female intervals. Compare only with a range for the same method. Women aged 41 to 51.","sources":[{"title":"Testosterone, Bioavailable and Total, Includes Sex Hormone-Binding Globulin (Adult Females, Children, or Individuals on Testosterone-Suppressing Hormone Therapy) (test 0081057)","url":"https://ltd.aruplab.com/Tests/Pub/0081057","publisher":"ARUP Laboratories"}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"The part of your testosterone that isn't tightly bound to SHBG, so it is free or loosely held by albumin. It is ordered less often than total testosterone.","url":"https://bloodtesttracker.com/markers/testosterone-bioavailable","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}