This assay is used to diagnose or rule out a rare extra-adrenal tumour called paraganglioma or a rare adrenal tumour called pheochromocytoma. Normetanephrine and Metanephrine are 3-Methoxy metabolites of Normetanephrine and Epinephrine. These are further metabolized to VMA. This test may be used as a first or second order screening test.
