Catecholamines, Fractionated, Urinary Free and Vanillylmandelic Acid (VMA), 24-Hour Urine

Collection is of greatest value for evaluation of hypertension if performed during a hypertensive episode. Test is used to evaluate hypertension, especially if paroxysmal and to evaluate orthostatic hypertension. Test is also useful in the diagnosis of pheochromocytoma and in the diagnosis and follow-up of neuroblastoma and ganglioneuroblastoma, retinoblastomas, carcinoid tumors, carotid body tumors, and stress. Preoperative evaluation of neoplasia of childhood, especially when the tumor is in or about the adrenals. Evaluate multiple endocrine adenomatosis. Evaluate patient with medullary carcinoma of thyroid (for coexistent pheochromocytoma).

See Catecholamines, Fractionated, Urinary Free, 24-Hour [004176] and Vanillylmandelic Acid (VMA), 24-Hour Urine [004143]. See the Interfering Substances Appendix.