Passage: Levels of stress can be measured. One way is through the use of psychological testing: The Holmes and Rahe Stress Scale [two scales of measuring stress] is used to rate stressful life events, while the DASS [Depression Anxiety Stress Scales] contains a scale for stress based on self-report items. Changes in blood pressure and galvanic skin response can also be measured to test stress levels, and changes in stress levels. A digital thermometer can be used to evaluate changes in skin temperature, which can indicate activation of the fight-or-flight response drawing blood away from the extremities. Cortisol is the main hormone released during a stress response and measuring cortisol from hair will give a 60- to 90-day baseline stress level of an individual.  This method of measuring stress is currently the most popular method in the clinic.

Question: What can be tested?
stress levels, and changes in stress levels