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An auxiliary test to fractionated plasma, metanephrine measurements in the diagnosis of pheochromocytoma and paraganglioma. An auxiliary test to urine vanillylmandelic acid and homovanillic acid determination in the diagnosis and follow-up of patients with neuroblastoma and related tumorsThe catecholamines (dopamine, epinephrine, and norepinephrine) are derived from tyrosine via a series of enzymatic conversions. All 3 catecholamines are important neurotransmitters in the central nervous system and play crucial roles in the autonomic regulation of many homeostatic functions, namely, vascular tone, intestinal and bronchial smooth muscle tone, cardiac rate and contractility, and glucose metabolism. Their actions are mediated via alpha and beta adrenergic receptors and dopamine receptors, all existing in several subforms. The 3 catecholamines overlap but also differ in their receptor activation profile and consequent biological actions.
48 hours prior to collection, avoid eating bananas, pineapple, chocolates, coffee, ice cream, high-cereal diets, potatoes, and B complex. Provide your drug history, USG results, and CT scan.