Sex hormone testing even in the blood has very limited value monitoring menopausal HRT & salivary testing, although adequate for testing cortisol hormone patterns is only semi-quantitative.  As for salivary levels of the sex hormones, read on.

It is common for practitioners to measure estradiol levels while monitoring hormone therapy, but only 3% of total estradiol & similarly 3% of testosterone are biologically active, making total estradiol & total testosterone levels quite useless for monitoring purposes.  And once estradiol & testosterone move from the bloodstream to the interiors of their target cells they become promptly converted into multiple derivatives that have opposing influences towards each other, so that even free hormone levels are of very limited value at telling us what's going on. In fact some tissues have as much as an eight-fold difference from those in the bloodstream, and different tissues have grossly different hormone concentrations from each other.  So unless you are wishing to study the salivary glands themselves for some very odd reason, measuring salivary sex hormone levels of sex hormones is meaninglessly pointless.

The idea of measuring sex hormone levels in the saliva sounds nice but is actually useless.  Salivary sex hormone levels are not offered by the major, credible, federally-accredited labs because of their lack of meaningfulness or accuracy, otherwise these labs would be quite happy to make the extra money. And in my own personal experience, I have seen results reported from some of these fly by night laboratories that are quite ludicrous, such as the several women who had their hormone levels measured in labs recommended by their chiropractors & were told their progesterone levels were quite high, even though these women were all in their sixties, had all undergone hysterectomies and were taking absolutely no forms of progesterone therapy whatsoever.  To me these tests were no more nor less than proof of an immoral scam.