Biochemical Diagnosis

• Avoid:

• 24 Hour Urine Studies: Urine container with 6N HCl refrigerated; measure creatinine to verify complete collection; avoid interfering substances

• VMA: FP ASA, coffee, tea, chocolate, bananas, vanilla

• Assays: HPLC with EC (Preferred)

• Fluorometric assay

• Metanephrines: FP Aldomet, FN Methylglucamine

• Catecholmines: FP Labetalol, Sotolol

• Plasma Metanephrines: FP Acetomenophen