Lab Testing & Blood Work

The essential foundation of safe and effective TRT

Why Lab Work Matters

Blood work is the cornerstone of responsible TRT. Without it, treatment is guesswork. Labs tell your doctor exactly where your hormones stand, how your body is responding to treatment, and whether any adjustments are needed.

Any clinic that prescribes testosterone without comprehensive blood work first is a red flag. Quality clinics require labs before starting and at regular intervals throughout treatment.

Initial Panel (Before Starting TRT)

A thorough pre-TRT panel typically includes:

  • Total Testosterone — The overall amount of T in your blood (optimal: 500-1000 ng/dL)
  • Free Testosterone — The bioavailable T not bound to proteins (optimal: 15-25 pg/mL)
  • SHBG — Sex hormone binding globulin (binds T, making it unavailable)
  • Estradiol (E2) — Estrogen level (important for symptom management)
  • LH & FSH — Pituitary hormones (helps identify primary vs. secondary hypogonadism)
  • Prolactin — Elevated levels can indicate pituitary issues
  • CBC (Complete Blood Count) — Includes hematocrit and hemoglobin (TRT can elevate these)
  • CMP (Comprehensive Metabolic Panel) — Liver and kidney function
  • Lipid Panel — Cholesterol and triglycerides
  • PSA — Prostate-specific antigen (baseline prostate health)
  • Thyroid Panel (TSH, T3, T4) — Thyroid function affects energy and metabolism
  • DHEA-S — Adrenal hormone marker

Monitoring Schedule

  • 6-8 weeks after starting — First follow-up labs to assess initial response and adjust dose
  • 3-4 months — Confirm levels are stable and symptoms are improving
  • Every 6 months (ongoing) — Standard monitoring once optimized
  • Annually — Full comprehensive panel including lipids, metabolic, and PSA

More frequent testing may be needed if dose adjustments are made or if any markers are out of range.

Understanding Your Results

Key ranges to know (note: "optimal" differs from "normal reference range"):

  • Total Testosterone: Lab "normal" is 264-916 ng/dL, but optimal for symptom relief is typically 500-900 ng/dL
  • Free Testosterone: Optimal is 15-25 pg/mL
  • Estradiol: Optimal is 20-40 pg/mL (too high or too low causes symptoms)
  • Hematocrit: Should stay below 54% (elevated = blood donation may be needed)
  • PSA: Should remain stable — sudden increases warrant investigation

Where to Get Labs

Most TRT clinics either draw blood in-office or provide lab orders for:

  • Quest Diagnostics — Nationwide network with thousands of locations
  • LabCorp — Another major national lab network
  • In-clinic draws — Some clinics have phlebotomists on staff
  • Mobile phlebotomy — Some services send a tech to your home

Find a TRT clinic that includes lab work in their protocol.