Testosterone, bioavailable — lab reference
In the reference guideDepends on total testosterone, SHBG, albumin, calculation, and assay.
THE PURSER WELLNESS ENCYCLOPEDIA
4 chapters, at your pace
573 resources for your curiosity29 matching listings grouped; alternative sources stay available.
What’s searchable?Depends on total testosterone, SHBG, albumin, calculation, and assay.
Morning collection preferred for men. Method and age matter; confirm unexpected low values.
Mayo example age 20-24: M 5.25-20.7; F <0.13-1.08. Declines with age and is method-dependent.
Ask your clinician to read this result with testosterone or estradiol, FSH, cycle phase, and pituitary context.
Ask your clinician to read this result with age, ovarian status, testosterone/estradiol, and pituitary context.
No single normal cutoff fits every patient. Ask your clinician to use age, baseline, trend, prostate size, risk factors, and shared decision-making.
Often used when total PSA is in an indeterminate zone. Ask your clinician to use the performing-lab risk table.
Method-specific. Clarify its role in hair, prostate, androgen therapy, or enzyme questions.
May assist selected fertility evaluations; not a routine wellness marker.
Ask your clinician to use exact assay cutoff and clinical indication.
Your lab may use its own range. Symptoms, medicines, and the types of white blood cells also matter.
Altitude, smoking, hydration, androgen therapy, and pregnancy may shift values.
Search looks for your words in titles, descriptions, available articles, learning guides, and video captions when available. The closest matches appear first. Duplicate posts are grouped, with links to other places you can read or watch them. Books, chapters, and reports have topic guides here; the original files and full book text are not available in this encyclopedia. Subscriber posts include a title and public summary; open Substack to read the full post.