Pheochromocytoma: Additional Studies

• Biochemical:

• Clonidine Suppression Test: Plasma catecholamine >500 pg/ml or <50 % decrease baseline 3 hrs s/p Clonidine 0.3 mg po

• Sensitivity 97%; Specificity 67%

• Glucogon Stimulation Test: Pretreat Phenoxybenzamine Plasma catecholamone > 2000 pg/ml or > 300% increase 2 min s/p Glucogon 1 mg IVP

• Specificity 100%; Sensitivity 81% Grossman et al HTN 1991;17:733

• Imaging:

• 131-I Meta-iodo-benzylguanadine Scintigraphy

• In 111 Pentotreitide Scintigragpy

• 6-18F Fluorodopamine PET scan