As a gynecologist working primarily in the field of hormone replacement for the past 8 years, saliva testing is an integral part of how I treat my patients. In my OB/GYN residency, I was taught to prescribe as Dr. Utian says: start with low doses and increase according to symptoms. Well, it just plain doesn’t work to do it that way. Without testing patients' hormone levels, it is impossible to determine if a patient’s symptoms of hair loss are from low estrogen, high cortisol or low thyroid. All 3 hormonal imbalances can lead to the same set of symptoms.