Testosterone, Bioavailable
Fasting RequiredWhat This Test Measures
Measures testosterone not bound to SHBG (free + albumin-bound); a comprehensive bioactivity estimate.
Preparation
Community guidance indicates LabCorp delivers the most accurate results for women on testosterone BHRT, as immunoassay methods used by some labs can report falsely elevated values. Draw at trough — just before your next injection — for the most clinically meaningful and consistent results between draws. These notes reflect common practices in TRT/BHRT communities.
Reflects common practices in thyroid, BHRT, and functional medicine communities. This may differ from standard clinical guidelines. Not medical advice — always discuss with your provider.
General guidelines only. Requirements vary by lab and individual. Confirm with your provider before adjusting any medications.
Turnaround Time
Varies by lab
Clinical Notes
Calculated from total T, SHBG, albumin
ICD-10 Codes
Common diagnosis codes associated with this test. Codes are assigned by your provider.
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Lab Codes
Proprietary codes used by each lab for this test.
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For informational purposes only
This page is for educational and research purposes only and does not constitute medical advice, diagnosis, or treatment recommendations. ICD-10 and CPT codes are assigned by your healthcare provider. Always consult a qualified healthcare provider before ordering any lab test or making decisions about your health.