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Investigation usually starts with uric acid (UA) determination in urine and plasma. UA, the final product of purine metabolism in humans, may be altered not only in purine IEM, but also in other related pathologies and clinical conditions. However, data and information about abnormal UA levels are scattered in the literature, often being controversial and confusing. A comprehensive overview has been elaborated, according to abnormal UA levels in urine and plasma, which associates these alterations with purine IEM. Other possible diseases, clinical conditions, diet and drug intake, related to the metabolism of uric acid, are also presented. The article includes tables that classify the disorders according to different patterns of UA alterations, with pertinent enzymes, clinical symptoms, inheritance and comments. Additionally, summarized pathophysiological mechanisms of important disorders are described. The overview is intended to assist in the interpretation of the results of UA analyses. It demonstrates that variation of UA concentrations in urine and plasma may constitute an effective tool in screening for purine IEM and other related pathological conditions.<\/jats:p>","DOI":"10.1007\/s10545-007-0455-8","type":"journal-article","created":{"date-parts":[[2007,5,23]],"date-time":"2007-05-23T19:34:30Z","timestamp":1179948870000},"page":"295-309","source":"Crossref","is-referenced-by-count":39,"title":["Uric acid changes in urine and plasma: An effective tool in screening for purine inborn errors of metabolism and other pathological conditions"],"prefix":"10.1002","volume":"30","author":[{"given":"R. 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