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Bioavailable testosterone includes free testosterone plus the fraction loosely bound to albumin, representing the roughly 50% of total testosterone that can actually enter tissues. It provides a more accurate picture of androgen status than total testosterone, especially when SHBG is abnormally high or low. Bioavailable testosterone is the most clinically relevant measure for men with borderline total testosterone and symptoms.
Also known as: Bio-available Testosterone, Bio-Available Testosterone (Calculated), Bioavailable Testosterone, Bioavailable Testosterone (calc), Bioavailable Testosterone (Calculated), Testosteron.biyolojik olarak mevcut, Testosteron.frei + schwach gebunden, Testosterona libre + débilmente unida
High bioavailable testosterone produces androgenic effects. Low bioavailable testosterone causes hypogonadal symptoms and can be low even when total testosterone is normal due to elevated SHBG.
Standard male range is approximately 130-680 ng/dL. Functional optimal is 250-500 ng/dL. Most useful for men with borderline total testosterone.