(oroticaciduria) An increased concentration of orotic acid in the urine.

Excess of orotic acid in the urine occurring in several metabolic disorders and also resulting from the administration of some drugs; one disorder is an autosomal recessive defect of pyrimidine metabolism due to deficiency of orate phosphoribosyltransferate or orotidine 5'-phosphatae decarboxylase.

Orotic aciduria, hereditary metabolic disorder characterized by an anemia with many large immature red blood cells, low white blood cell count, retarded growth, and the urinary excretion of large quantities of orotic acid, an intermediate in the synthesis of pyrimidine nucleotides. The disease is...