A stretchy patch that, applied directly to the skin, wicks up sweat and assesses how much cortisol a person is producing has been developed by the researchers at Stanford University. This offers a novel approach for the early detection of various diseases and evaluation of sports performance. Clinical tests that measure cortisol provide an objective gauge of emotional or physical stress in research subjects and can help doctors tell if a patient’s adrenal or pituitary gland is working properly. If the prototype version of the wearable device becomes a reality, it could allow people with an imbalance to monitor their own levels at home. A fast-working test like this could also reveal the emotional state of young - even non-verbal - children, who might not otherwise be able to communicate that they feel stress.