Anxiety disorders are diagnosed based on a physical exam and an evaluation by a physician that involves asking questions about the symptoms a patient is experiencing, according to WebMD. A lab test or blood test can not indicate levels of anxiety, but physical symptoms causing anxiety may be uncovered.
When testing for anxiety disorders, physicians commonly evaluate the duration of the symptoms and the intensity in which physical and mental ailments occur to diagnose an anxiety disorder, explains WebMD. The physician usually observes the patient's behavior and attitudes, looking for instances of fear, worry, stress and nervousness. Treatment usually involves therapy and in some cases, medication to treat the physical symptoms.