Evaluating the Prevalence of Acute Hepatic Porphyria in Postural Tachycardia Syndrome

Autonomic function test (orthostatic blood pressure and heart rate response to tilt, heart rate response to deep breathing, the Valsalva ratio, and beat-to-beat blood pressure measurements during phases II and IV of the Valsalva maneuver, tilt, and deep breathing). These combined tests provide a measurement of adrenergic, cardiovagal responses.

Genetic testing: for Acute hepatic porphyria panel - with intent to use Saliva kit

Urine PBG, ALA and porphyrins in a spot urine sample with results normalized to urine creatinine

"To determine the following laboratory analyses:~CBC, CMP, Iron studies (Ferritin and iron studies)"