Testosterone, bioavailable — lab reference
In the reference guideDepends on total testosterone, SHBG, albumin, calculation, and assay.
THE PURSER WELLNESS LIBRARY
4 chapters, at your pace
487 discoveries for your curiosity17 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.
Interpret with testosterone or estradiol, FSH, cycle phase, and pituitary context.
Interpret with age, ovarian status, testosterone/estradiol, and pituitary context.
No single normal cutoff fits every patient. Use age, baseline, trend, prostate size, risk factors, and shared decision-making.
Often used when total PSA is in an indeterminate zone. 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.
Use exact assay cutoff and clinical indication.
Lab-specific. Interpret with symptoms, medication effects, and differential.
Altitude, smoking, hydration, androgen therapy, and pregnancy may shift values.
Best match puts all-term matches before partial matches and related reading. Identical social posts and matching long titles across other sources are grouped when access is the same. Search covers published titles, descriptions, available article text, report overviews, and the full text of the nutrient, gene and learning-essential reference pages. Books, uploaded chapters and downloads-page reports are searchable through selected editorial guides and topic names; the original files and full book text are not published. Full Drive reports are not copied into search. Substack subscriber titles and public summaries are included; full subscriber content opens on Substack. Video transcripts are added when available.