Circulating and urinary catecholamines in pheochromocytoma. Diagnostic and pathophysiologic implications.


Three biochemical tests for the diagnosis of pheochromocytoma were evaluated in 24 patients with proved tumors and 40 patients whose clinical picture was suspect but who had no evidence of the disease. Measurement of resting, supine plasma catecholamines (by radioenzymatic assay) was more useful than either 24-hour urinary vanillylmandelic acid (VMA) or… (More)