How do you make the diagnosis of postural orthostatic tachycardia syndrome (pots)?

Heart rate changes. Postural orthostatic tachycardia syndrome (pots) is characterized by an abnormal heart rate increase with standing. Typically blood pressure does not change. Patients have a variety of symptoms including fatigue, dizziness and fainting.
SEVERAL BUT A . Tilt test helps quite a bit to rule it out.