The healthcare provider often suspects this condition after the history and physical exam. The blood pressure can be measured when a person is lying down, sitting, and standing. If the blood pressure drops abnormally when a person stands up, the diagnosis can be made.
Other tests may be needed to determine the cause. For example, a blood test called a cortisol level can help detect low adrenal hormone levels. A blood test called a blood glucose level can help diagnose diabetes. An imaging test of the heart called echocardiography can help diagnose heart failure or aortic stenosis. Other tests may also be used, depending on the suspected cause.