Saliva has already be used to test hormones in diagnosing many endocrine problems. I use saliva testing in helping to balance hormones in women with premenstrual symptoms, as well as women entering menopause, and those with adrenal fatigue. It is a unique way to evaluate free bio-available hormone levels as opposed to both free and bound hormone levels as is measured in blood tests. Now, saliva may be used to diagnose other illnesses and diseases.