Blood testsHormones

Testosterone, free, bioavailable and total.

Testosterone three ways, with the proteins that carry it.

  • Markers5
  • SampleBlood draw
  • FastingNot stated
  • Draw timeMorning
Join the waitlist

Orders are not open yet.

Design preview

What it measures.

In plain English. This describes what a lab measures; it cannot tell you what your own result means.

  • Total testosteroneTotal T

    All the testosterone in the blood, both the part carried by proteins and the small part that circulates free. It is highest in the morning, which is why it is usually drawn early.

  • Free testosteroneFree T

    The small share of testosterone that is not bound to proteins. Labs measure it directly or calculate it from total testosterone, SHBG and albumin.

  • Bioavailable testosteroneBioavailable T

    Free testosterone plus the testosterone loosely bound to albumin: the share not held by SHBG.

  • Sex hormone binding globulinSHBG

    A protein made by the liver that carries testosterone and estradiol in the blood. How much there is changes how much testosterone is free.

  • Albumin

    The main protein in the blood, made by the liver. It also carries hormones such as testosterone.

How to prepare.

  1. The lab gives no fasting rule for this test. Ask when you order if you are unsure.
  2. No testosterone cream or gel on the inner arms for 24 hours before the draw.

Often taken with it.

  • Hormones2 markers

    Testosterone, free and total

    Measures total testosterone and the share that circulates free.

    • No fasting
    • Morning draw

    Total T, Free T

  • Men’s health76 markers

    Men’s hormone checkup

    Hormones, PSA, thyroid, cholesterol, blood count and metabolism in one draw.

    • Fasting 12 to 14 hours
    • Morning draw

    Total T, Free T, E2, FSH and more

The waitlist makes no eligibility, diagnosis, treatment, prescribing, or medication access decisions.

Clinical questions, eligibility, and care decisions happen later with a licensed provider, outside this form and only where legally available.