Saliva testing is a non-invasive collection method where patients collect their saliva in plastic tubes in order to measure hormones like cortisol, estrogens, progesterone, and androgens. This non-invasive saliva collection is ideal for patients because it allows them to collect their sample in the privacy of their home or office. Steroid hormones in the bloodstream are 95-99% bound to carrier proteins, and in this form are unavailable to target tissues. Saliva testing measures the amount of hormone available to target tissues – the bioavailable amount. For this reason, saliva testing better relates to specific symptoms of excess or deficiency, and is a good option for monitoring hormone therapy.
Some analytes cannot be tested using immunoassays, the methodology used for most of our saliva testing. For that reason, ZRT developed LC-MS Saliva Steroid Profiles using liquid chromatography/tandem mass spectrometry (LC-MS/MS). These profile tests a broad range of bioavailable hormones and hormone metabolites in one convenient saliva sample collection. LC-MS testing allows for accurate reporting of estrogens down to extremely low levels, such as those seen in men, children, and people using aromatase inhibitors, and includes a test for ethinyl estradiol, 3 hormone blockers, and melatonin.