| http://www.w3.org/ns/prov#value | - This free or unbound hormone is what we want to measure, since it is active or bioavailable to the target tissues such as the breast, uterus, brain, and skin.Many studies in the scientific literature have shown that there is a strong correlation between the levels of steroid hormones in saliva and the bio-available (free) levels of steroids in the bloodstream.
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