What is the definition or description of: metanephrines?

Metabolic product: Metanephrins are metabolic products of cathecolamines: epinephrin and norepinephrin and can be used to diagnose excess production of these adrenal/sympathetic hormones. They can be measured in blood and urine and are very elevated in a condition called pheochromocytoma which is a tumor found mostly in the adrenal glands that causes severe hypertension.

Metabolite: It is a metabolite or product formed when adrenaline is metabolized.