Metanephrine

**Semantic type:** Hormone

**Definition:** A product of the O-methylation of epinephrine by catechol O-methyltransferase, which has no physiologic activity. Increased levels of free metanephrine in patient blood plasma samples may be a diagnostic indicator for pheochromocytoma.

**Synonyms:** - 4-Hydroxy-3-Methoxy-Alpha-((Methylamino)Methyl)-Benzenemethanol - Benzenemethanol, 4-Hydroxy-3-Methoxy-Alpha-((Methylamino)Methyl)- - METANEPHRINE, (+/-) - Metadrenaline