Diagnosing POTS can often be difficult for doctors, because of the overlap of symptoms with other conditions associated with orthostatic intolerance. Doctors usually begin to suspect POTS after observing characteristic symptoms and signs. Testing typically involves a physical examination with blood pressure and heart rate measurements. Doctors will perform these tests while the person is lying, sitting, and standing to identify any changes. Some physicians may use a tilt table test; they check blood pressure and heart rate on a person who is lying down, then the table rotates the person into a standing position to safely and efficiently repeat the tests.

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