Verbatim response from ChatGPT
Short answer
- If you want the most accurate, clinically validated measurements: order venous-serum tests through LabCorp or Quest (LabCorp OnDemand / Quest Direct / DirectLabs). A proper blood draw is the gold standard.
- If you prefer a convenient at‑home kit with good quality and nurse/telehealth support: LetsGetChecked or Everlywell are the best-known options.
- Avoid relying on saliva-only male testosterone tests for diagnosis — serum (venous) or validated fingerstick serum/Dried Blood Spot panels are preferable.
Recommended services (why)
- LabCorp / Quest (via LabCorp OnDemand, Quest Direct, DirectLabs): venous blood draws at a phlebotomy site, most clinically accepted assays, easy to get full panels (testosterone, free T, SHBG, LH, FSH, estradiol, PSA, CMP, CBC). Best if you plan to act on results with a clinician.
- LetsGetChecked: at‑home fingerstick kits, includes nurse review and telehealth follow-up; good user experience and covers male hormone panels (total T, free T, SHBG, estradiol, LH, FSH, prolactin, etc.).
- Everlywell: at‑home fingerstick kits, reliable logistics and clear reports; good for screening baseline testosterone and common hormones.
- InsideTracker: focuses on performance biomarkers and gives actionable lifestyle recommendations; uses lab draws (LabCorp/Quest) or at‑home testing depending on the plan.
- ZRT Laboratory: strong for hormone testing overall and saliva/dried‑bloodspot expertise; useful if you need specialty hormone assays, but for male testosterone prefer serum.
Which tests to include (suggested panel for men)
- Total testosterone (morning)
- Free testosterone (calculated or direct)
- SHBG (to interpret free T)
- LH and FSH (pituitary function)
- Estradiol (E2)
- Prolactin
- DHEA‑S
- PSA (if >40 or per provider)
- TSH and free T4 (thyroid affects hormones)
- CMP (liver, kidney, glucose, electrolytes), CBC, fasting glucose or A1c, lipid panel (overall health)
Timing and sample-type tips
- Testosterone is highest in the morning: collect samples between ~7–10 AM.
- Venous serum (LabCorp/Quest) is the most accurate. If using at‑home kits, follow fasting/time instructions carefully.
- Fingerstick/dried blood spot is convenient but slightly less precise than venous blood — still useful for screening or monitoring trends.
- Saliva tests are less reliable for male testosterone and generally not recommended for diagnostic decisions.
Cost and next steps
- LabCorp/Quest direct tests typically cost $50–$250 depending on the panel. At‑home kits (LetsGetChecked/Everlywell) usually $80–$250.
- After you have results, review them with your primary care doctor or an endocrinologist before starting any hormone therapy. If you’re considering testosterone replacement, a clinician should confirm low levels, evaluate causes, and monitor safety (hematocrit, PSA, liver).
If you tell me whether you want maximum clinical accuracy (willing to go to a draw center) or full at‑home convenience, I can recommend 1 specific kit/service and the exact tests to order.