HORMONES
Free Testosterone
Also known as Free T
What it is
Free testosterone is the fraction of testosterone not bound to carrier proteins. It is the portion immediately available to tissues.
Why it matters
Free testosterone often correlates better with symptoms than total testosterone, especially when SHBG is high or low. Two patients with the same total value can have very different free testosterone.
Range GPLX watches for
GPLX generally targets a free testosterone range in the upper half of the lab reference range in symptomatic men. Ranges vary by assay method. Interpretation belongs with your physician.
This educational range is not a personal diagnostic threshold. Your physician interprets your result in context of your full biomarker panel, medications, symptoms, and history.
What abnormal values can suggest
If low
A low free testosterone value can suggest hypogonadism, elevated SHBG, hypothyroidism, or medications that shift binding proteins.
If high
A high free testosterone value can suggest exogenous testosterone use, PCOS in women, or a suppressed SHBG state.
This marker is reviewed when clinically appropriate as part of physician-directed labs. Membership is $39.99/month; consultation is $30.
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