Cortisol varies over the day, so timed collection can report a daily pattern. Blood and saliva are different sample matrices and should not be treated as universal substitutes.
The laboratory profile does not alone diagnose burnout, “adrenal fatigue,” insomnia or autoimmune disease. Symptoms require appropriate medical assessment.
Do not start hormones, DHEA, adaptogens or other treatment based only on a self-ordered report. Discuss abnormal findings with an appropriate healthcare professional.