Hypervigilance can be tested through a psychiatric consultation. Hypervigilance often affects a person's vital signs, so a healthcare provider will note changes in temperature, heart rate, breathing rate, or blood pressure. Tests may be done to look for medical causes of hypervigilance symptoms, including a complete blood count (CBC), thyroid test, electrolyte test, urinalysis, toxicology screening, computerized tomography (CT) scan, magnetic resonance imaging (MRI), or ultrasound.