4-Hydroxy-3-methoxyphenylacetic acid; a phenol found in human urine; produced through the methylation of homoprotocatechuic acid on the meta-OH group. It is the principal urinary metabolite of dopa and dopamine.
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ho·mo·va·nil·lic acid -və-'nil-ik- n a dopamine metabolite C9H10O4 excreted in human urine
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ho·mo·va·nil·lic ac·id (ho″mo-və-nilґik) a product of catecholamine metabolism; elevated urinary levels occur in patients with pheochromocytoma or other catecholamine-secreting tumors. Abbreviated HVA.Medical dictionary. 2011.