Instead of diagnosing patients based on symptoms such as depressed mood and fatigue, the institute wants to use more quantitative data, such as genetic or brain-imaging data, in diagnoses. Such a shift would bring mental health diagnoses to par with diagnoses in other health fields, according to the institute's statement. Most other fields abandoned symptom-based diagnosis after the middle of the last century, but not psychiatry. After all, some of the proposed lab measures for mental health, such as genetics and brain images, weren't even measurable until recently. It took technology a while to catch up to the kinds of data that may be associated with mental health disorders.