The Lineup: What is Being Tested?
Total & Free Testosterone
What it is: Testosterone is the primary male sex hormone. Total Testosterone is the entire amount floating around in your blood. Free Testosterone is the tiny fraction (usually only 1–2%) that is actually active, unattached, and ready for your body to use.
Estradiol
What it is: The primary form of estrogen (the "female" hormone), but men need it too! Men naturally convert a portion of their testosterone into estradiol.
SHBG (Sex Hormone-Binding Globulin)
What it is: A protein made by your liver that acts like a "hormone sponge." It travels through your blood, grabs onto testosterone, and locks it up.
LH & FSH (Luteinizing Hormone & Follicle-Stimulating Hormone)
What they are: Brain signals. Your brain (specifically the pituitary gland) releases these hormones to talk to your testicles. LH tells your testicles to produce testosterone. FSH tells your testicles to produce sperm.
DHEA-S (Dehydroepiandrosterone Sulfate)
What it is: A precursor hormone made by your adrenal glands (your stress centers). Think of it as the raw ingredient your body uses to create other hormones, including testosterone and estrogen.
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